Multimeters · Solar PV

Ranked on DC voltage, CAT rating and DC current.

Top 10 Best Multimeters for Solar Panel Testing

Our top 10 best multimeters for solar panel testing, ranked for open-circuit voltage, short-circuit and string current, polarity checks and logging, from a 1500 V PV clamp to budget 1000 V meters for off-grid systems.

See the Full Roundup Compare Side by Side

Compared

100%

Spec-Verified

What solar work demands from a meter

A photovoltaic array is a DC source that stays live whenever light falls on it. Testing one means reading open-circuit voltage (Voc) that can reach hundreds of volts on a single string, comparing short-circuit or operating current between strings, and confirming polarity before anything is connected to an inverter. Those jobs reward a high DC voltage rating with a matching CAT rating, a DC-capable clamp and a meter that stays readable on a hot, bright roof. A sign error on the display is worth understanding first: see why a multimeter shows negative voltage, and for bypass diodes in a junction box, our guide to testing a diode.

We ranked these ten on the DC voltage and CAT ratings first, then on whether they can read DC current through a clamp, then on logging, accuracy and toughness. Off-grid owners will also find our guide to checking a 12V leisure battery useful, and for clamp basics read the clamp meter buying guide. If two Flukes on this list are your shortlist, see Fluke 87V vs Fluke 179 and our Fluke 87V review.

PV arrays can't be switched off in daylight

Opening a DC isolator or inverter breaker stops current flowing, but every module in the string is still generating voltage as long as light reaches it, and a string's Voc can be several hundred volts. DC arcs do not self-extinguish the way AC arcs do, so never unplug a connector under load, never break a short-circuit test while current flows, and only work on strings if you are trained for it. Use a meter and leads whose CAT rating covers the full DC voltage, and wear insulated gloves and eye protection.

Quick comparison

#	Meter	Max DC volts	CAT rating	DC current	Best for
1	Fluke 393 FC	1500 V	CAT III 1500V / CAT IV 600V	999.9 A AC/DC jaw	Commercial and utility-scale strings
2	KAIWEETS HT208D	1000 V	CAT III 1000V / CAT IV 600V	1000 A AC/DC jaw	Budget DC string current on rooftop systems
3	Fluke 87V	1000 V	CAT III 1000V / CAT IV 600V	10 A in series (20 A for 30 s)	Voc checks and balance-of-system work
4	Fluke 289	1000 V	CAT III 1000V / CAT IV 600V	10 A in series (20 A for 30 s)	Logging array or battery voltage over a day
5	Klein Tools MM720	1000 V	CAT III 1000V / CAT IV 600V	10 A in series	An affordable 1000 V meter for installers
6	Fluke 179	1000 V	CAT III 1000V / CAT IV 600V	10 A in series	Accurate Voc readings with Min/Max
7	UNI-T UT181A	1000 V	CAT III 1000V / CAT IV 600V	10 A in series (20 A for 30 s)	Logging plus two-probe module temperature
8	EEVblog Brymen BM786	1000 V	CAT III 1000V / CAT IV 600V	10 A in series (20 A under 30 s)	High-resolution off-grid and battery work
9	Fieldpiece SC480	1000 V	CAT III 1000V / CAT IV 600V	600 A AC jaw only	The inverter's AC output side
10	UNI-T UT61E+	1000 V	CAT III 1000V / CAT IV 600V	20 A range in series	Small off-grid panels on a budget

KAIWEETS lists 1000 V for DC but 750 V for AC on the HT208D. The Fluke 393 FC also reads AC current to 2500 A with its included iFlex probe.

How the ten compare on paper

Fluke 393 FC

1500 V

KAIWEETS HT208D

1000 V

Fluke 87V

1000 V

Fluke 289

1000 V

Klein Tools MM720

1000 V

Fluke 179

1000 V

UNI-T UT181A

1000 V

EEVblog Brymen BM786

1000 V

Fieldpiece SC480

1000 V

UNI-T UT61E+

1000 V

Maximum DC voltage. Only one meter covers 1500 V commercial and utility strings.

KAIWEETS HT208D

1000 A (clamp)

Fluke 393 FC

999.9 A (clamp)

UNI-T UT61E+

20 A range

Fluke 87V

10 A

Fluke 289

10 A

Klein Tools MM720

10 A

Fluke 179

10 A

UNI-T UT181A

10 A

EEVblog Brymen BM786

10 A

Bars use a logarithmic scale: each step is ten times the last.

Highest continuous DC current, on a log scale. The two clamps read it through the jaw; the rest need the leads in series. The Fieldpiece SC480 is left out because its jaw reads AC only.

KAIWEETS HT208D

±(0.5% + 3)

Fluke 179

±(0.09% + 2)

UNI-T UT61E+

±(0.05% + 5)

EEVblog Brymen BM786

0.03% + 2d

Fluke 289

0.025% basic

UNI-T UT181A

±(0.025% + 5)

Best published DC voltage accuracy, as a percentage of reading (lower is better). The Fluke 393 FC, Fluke 87V, Klein MM720 and Fieldpiece SC480 figures aren't in our source data, so they are left out.

What to look for in a solar meter

DC voltage rating

The meter's maximum must exceed the string's cold-weather Voc, not just its nameplate figure.

CAT rating on DC

CAT III 1000V is the floor for most strings; 1500 V systems need a CAT III 1500V meter and leads.

DC clamp

A Hall-effect jaw reads string current without opening a connector under load.

Polarity warning

Reversed strings at a combiner are a costly mistake; an audible polarity alarm catches them.

Logging

Recording voltage across a day separates shading and soiling problems from a failed module.

Field toughness

Rooftops are hot, bright and dusty: look for IP ratings, readable displays and drop ratings.

Why the meter's limit must beat cold-weather Voc

Crystalline silicon modules gain voltage as they cool, typically a few tenths of a percent per degree Celsius below the 25 °C test condition. A string labeled at 900 V Voc can therefore read above 1000 V on a freezing morning, beyond every 1000 V meter here. Check the module's temperature coefficient and the lowest site temperature before you choose a meter, and see unstable multimeter readings if a Voc reading wanders as clouds pass.

OSBy OhmSavvy Research TeamSpecs verified against manufacturer data · 1 of 10 hands-on tested

Disclosure: OhmSavvy earns a commission from qualifying Amazon purchases made through the links below, at no extra cost to you. How we're funded.

At a glance

Our top picks

Best for Solar PV4.7★★★★★

Fluke 393 FC

Fluke's solar clamp: CAT III 1500V, 1500 V DC, 999.9 A DC through the jaw and DC power, in an IP54 body.

Check price on Amazon →Why we picked it ↓

Best Budget AC/DC Clamp4.2★★★★☆

KAIWEETS HT208D

A low-cost 1000 A AC/DC clamp with 1000 V DC, CAT III 1000V, LoZ, VFD and inrush modes.

Check price on Amazon →Why we picked it ↓

Best for Professionals4.8★★★★★

Hands-on Tested

Fluke 87V

The step-up pick for anyone who needs CAT IV protection and high-resolution readings daily.

Check price on Amazon →Why we picked it ↓

Also great

4
Fluke 289
Best for Low Resistance4.7★★★★★
Check pricePrice →
5
Klein Tools MM720
Best Budget Electrician's Meter4.6★★★★★
Check pricePrice →
6
Fluke 179
Best for Industrial Work4.7★★★★★
Check pricePrice →
7
UNI-T UT181A
Best Color-Screen Data Logger4.4★★★★☆
Check pricePrice →
8
EEVblog Brymen BM786
Best Brymen for Electronics4.6★★★★★
Check pricePrice →
9
Fieldpiece SC480
Best Wireless HVAC Clamp4.5★★★★★
Check pricePrice →
10
UNI-T UT61E+
Best Budget Meter for Electronics4.5★★★★★
Check pricePrice →

Quick shopping

Compare at a glance

Swipe sideways on mobile to see every spec.

Model	Award	Rating	Accuracy	Safety rating	Auto-ranging
#1Fluke 393 FC	Best for Solar PV	4.7★★★★★	True RMS	CAT III 1500V / CAT IV 600V	Not stated	Check price →
#2KAIWEETS HT208D	Best Budget AC/DC Clamp	4.2★★★★☆	True RMS	CAT IV 600V / CAT III 1000V	Yes (manual RAN button)	Check price →
#3Fluke 87V✓ Tested	Best for Professionals	4.8★★★★★	True RMS	CAT III 1000V / CAT IV 600V	Yes	Check price →
#4Fluke 289	Best for Low Resistance	4.7★★★★★	True RMS, 0.025% basic DC V	CAT IV 600V / CAT III 1000V	Yes (manual override)	Check price →
#5Klein Tools MM720	Best Budget Electrician's Meter	4.6★★★★★	True RMS, 6,000-count	CAT IV 600V / CAT III 1000V	Yes (manual RANGE button)	Check price →
#6Fluke 179	Best for Industrial Work	4.7★★★★★	True RMS	CAT III 1000V / CAT IV 600V	Yes (manual override)	Check price →
#7UNI-T UT181A	Best Color-Screen Data Logger	4.4★★★★☆	True RMS, ±(0.025%+5) DC V	CAT III 1000V / CAT IV 600V	Yes (manual override)	Check price →
#8EEVblog Brymen BM786	Best Brymen for Electronics	4.6★★★★★	AC+DC True RMS, 0.03% DC V	CAT III 1000V / CAT IV 600V	Yes (manual override)	Check price →
#9Fieldpiece SC480	Best Wireless HVAC Clamp	4.5★★★★★	True RMS	CAT IV 600V / CAT III 1000V	Yes (manual Range button)	Check price →
#10UNI-T UT61E+	Best Budget Meter for Electronics	4.5★★★★★	True RMS, ±(0.05%+5) DC V	CAT III 1000V / CAT IV 600V	Yes (manual override)	Check price →

In depth

Detailed reviews

#1Best for Solar PV4.7★★★★★

Fluke 393 FC

Fluke's solar clamp: CAT III 1500V, 1500 V DC, 999.9 A DC through the jaw and DC power, in an IP54 body.

Best for:Solar PV installation and service

The 393 FC is built for PV arrays. It is rated CAT III 1500 V / CAT IV 600 V, measures up to 1500 V DC and 1000 V AC, clamps up to 999.9 A AC or DC with a zero function for DC, and the included 18-inch iFlex extends AC current to 2500 A. It calculates DC power, sounds an audio polarity alarm to catch miswired strings, and its continuity check lights the display green. It is IP54 and logs to Fluke Connect. It has no temperature or µA function and costs far more than a general clamp.

Why it fits: First because it is the only meter here built for PV: CAT III 1500V, 1500 V DC, a 999.9 A DC jaw with zero, DC power, an audible polarity alarm and IP54. It has no temperature or microamp function, and the price only makes sense for installers and O&M crews.

Accuracy: True RMS
Safety rating: CAT III 1500V / CAT IV 600V
Auto-ranging: Not stated
Best for: Solar PV installation and service

Reasons to buy

+1500 V DC and CAT III 1500V rating
+DC clamp to 999.9 A plus DC power
+Audio polarity alarm, IP54 and iFlex included

Reasons to avoid

−Expensive for anyone not working on PV
−No temperature or µA function

Check price on Amazon →Price shown at retailer, may fluctuate.

#2Best Budget AC/DC Clamp4.2★★★★☆

KAIWEETS HT208D

A low-cost 1000 A AC/DC clamp with 1000 V DC, CAT III 1000V, LoZ, VFD and inrush modes.

Best for:Budget DC current and small solar checks

The HT208D clamps AC and DC current to 1000 A and measures DC voltage to 1000 V (AC to 750 V), with a CAT IV 600V / CAT III 1000V rating. That makes it an affordable way to read DC string current on small solar systems. It adds LoZ, a VFD filter, AC inrush, NCV, temperature to 1000 °C, capacitance and a color 6,000-count display. KAIWEETS doesn't publish resolution figures on its page, the current accuracy is ±(2.5% + 5), and there is no µA range or solar-specific function such as polarity alarm or DC power.

Why it fits: Second because it is the cheapest way here to clamp DC string current, up to 1000 A, with 1000 V DC and CAT III 1000V. Its current accuracy of ±(2.5% + 5) is coarse, and it has no polarity alarm or DC power function.

Accuracy: True RMS
Safety rating: CAT IV 600V / CAT III 1000V
Auto-ranging: Yes (manual RAN button)
Best for: Budget DC current and small solar checks

Reasons to buy

+AC and DC clamp current to 1000 A
+1000 V DC and CAT III 1000V
+LoZ, VFD filter, inrush and NCV

Reasons to avoid

−No µA range or PV-specific functions
−Resolution not published; ±(2.5% + 5) current accuracy

Check price on Amazon →Price shown at retailer, may fluctuate.

#3Best for Professionals4.8★★★★★Hands-on Tested

Fluke 87V

The step-up pick for anyone who needs CAT IV protection and high-resolution readings daily.

Best for:Industrial technicians, daily professional use

The 87V is Fluke's industrial-grade step up from the 117 — a 1000V CAT III / 600V CAT IV rating, a 6,000-count main display with a 19,999-count high-resolution mode, and a 32-segment analog bar graph for watching signals change in real time.

Why it fits: It carries our Hands-on Tested badge and reads 1000 V DC under a CAT IV 600V / CAT III 1000V rating, which covers residential and most commercial strings. It has no clamp, so current is limited to 10 A in series, and 1500 V systems are beyond it.

Accuracy: True RMS
Safety rating: CAT III 1000V / CAT IV 600V
Auto-ranging: Yes
Best for: Industrial technicians, daily professional use

Reasons to buy

+Joint-highest CAT rating in this list (CAT IV 600V / CAT III 1000V)
+19,999-count high-resolution mode
+Analog bar graph tracks fast-changing signals

Reasons to avoid

−Among the most expensive picks here
−Overkill for casual home use

Check price on Amazon →Read the full Fluke 87V review →Price shown at retailer, may fluctuate.

#4Best for Low Resistance4.7★★★★★

Fluke 289

The only handheld here with a 50 Ω range at 1 mΩ resolution, plus 0.01 µA current resolution and on-screen trend logging.

Best for:Low-ohm, µA and logged electronics work

The Fluke 289 is a 50,000-count True RMS logging meter rated CAT IV 600V / CAT III 1000V. Its two-terminal 50 Ω range resolves 1 mΩ using a 10 mA test current, and relative mode removes test-lead resistance, so you can check shunts, contacts and PCB traces without a separate milliohm meter. The 500 µA range resolves 0.01 µA with a published burden of about 102 µV per µA. TrendCapture graphs logged readings on the meter itself, and LoZ and a low-pass filter cover electrical work too. The catch is the price, roughly three times a good hobby meter.

Why it fits: Its TrendCapture logging records voltage over hours on the meter itself, useful for watching an array through passing cloud or a battery bank overnight, and it has 0.025% basic DC accuracy at 1000 V. It ranks behind the 87V on cost and has no DC clamp.

Accuracy: True RMS, 0.025% basic DC V
Safety rating: CAT IV 600V / CAT III 1000V
Auto-ranging: Yes (manual override)
Best for: Low-ohm, µA and logged electronics work

Reasons to buy

+50 Ω range with 1 mΩ resolution and REL lead zeroing
+500 µA range with 0.01 µA resolution and published burden voltage
+Logs and graphs readings on screen (TrendCapture)

Reasons to avoid

−Expensive, and sold here by a third-party seller
−Two-terminal low-ohm range, not true 4-wire Kelvin

Check price on Amazon →Read the full Fluke 289 review →Price shown at retailer, may fluctuate.

#5Best Budget Electrician's Meter4.6★★★★★

Klein Tools MM720

CAT IV 600V, 1000V, LoZ and True RMS at a budget price, the most panel-ready meter in this tier.

Best for:Electricians working panels and feeders

The MM720 is rated CAT IV 600V / CAT III 1000V and measures up to 1000V AC/DC, with a LoZ mode for ghost voltages. It is True RMS, auto-ranging and 6,000-count, and the reverse-contrast display adjusts itself to the light. Current runs from a 600.0 µA range (0.1 µA) to 10 A. It adds 60 MΩ resistance, capacitance to 6,000 µF, temperature to 1832°F, IP42 and a 2 m drop rating, and a carrying pouch comes in the box. Klein lists no NCV.

Why it fits: A 1000 V AC/DC meter with CAT IV 600V / CAT III 1000V, IP42 and a 2 m drop rating for a fraction of the Fluke price. Current stops at 10 A through the leads and there is no logging, but for Voc checks on rooftop strings it does the job.

Accuracy: True RMS, 6,000-count
Safety rating: CAT IV 600V / CAT III 1000V
Auto-ranging: Yes (manual RANGE button)
Best for: Electricians working panels and feeders

Reasons to buy

+CAT IV 600V and 1000V AC/DC
+LoZ mode for ghost voltages
+IP42, 2 m drop rating and pouch included

Reasons to avoid

−Priced at the top of the budget tier
−No non-contact voltage detection

Check price on Amazon →Price shown at retailer, may fluctuate.

#6Best for Industrial Work4.7★★★★★

Fluke 179

Fluke's do-everything bench-and-field meter: CAT IV 600V, True RMS, temperature and a 6,000-count display with bar graph.

Best for:Industrial maintenance, electronics, HVAC

The Fluke 179 is the full-featured member of Fluke's 170 series: True RMS, CAT III 1000V and CAT IV 600V, a 6,000-count backlit display with an analog bar graph, and temperature measurement with the supplied thermocouple. It adds Min/Max-Average recording and both manual and automatic ranging, so it suits industrial maintenance and electronics work where the 117's electrician-focused extras matter less than range and resolution.

Why it fits: Its 1000 V DC range at ±(0.09% + 2) and Min/Max-Average recording make it a precise, simple Voc meter with the same CAT ratings as the 87V. Like the other lead-type meters here it reads current only in series to 10 A.

Accuracy: True RMS
Safety rating: CAT III 1000V / CAT IV 600V
Auto-ranging: Yes (manual override)
Best for: Industrial maintenance, electronics, HVAC

Reasons to buy

+CAT IV 600V for service entrances and outdoor feeds
+Temperature, capacitance to 10,000 µF and frequency to 100 kHz
+Min/Max-Average recording and analog bar graph

Reasons to avoid

−Costs more than the 117 for features many electricians won't use
−No non-contact voltage detection

Check price on Amazon →Read the full Fluke 179 review →Price shown at retailer, may fluctuate.

#7Best Color-Screen Data Logger4.4★★★★☆

UNI-T UT181A

A 60,000-count colour-screen logging meter that stores 20,000 readings and graphs them, for well under Fluke 287 money.

Best for:Logging battery drain and drift

The UT181A is a True RMS logging meter with a 3.5-inch colour TFT, 60,000 counts and CAT III 1000V / CAT IV 600V. Its lowest ranges are 600 µA and 600 Ω, so at 60,000 counts it reads to 0.01 µA and 0.01 Ω, though UNI-T doesn't print a per-range resolution. It logs 20,000 readings with a real-time clock and trend graph, measures two thermocouples at once, and runs on a rechargeable Li-ion pack. It has IP65 sealing and a 1 kHz low-pass filter. Bluetooth needs UNI-T's optional adaptor, despite what the listing implies.

Why it fits: It logs 20,000 readings with a trend graph, measures two thermocouples at once for module and ambient temperature, and is IP65, all useful on a rooftop. It ranks seventh because it is costly for a UNI-T and reads current only through the leads.

Accuracy: True RMS, ±(0.025%+5) DC V
Safety rating: CAT III 1000V / CAT IV 600V
Auto-ranging: Yes (manual override)
Best for: Logging battery drain and drift

Reasons to buy

+20,000-reading logger with trend graph on a colour screen
+60,000 counts, 600 µA and 600 Ω lowest ranges
+Rechargeable battery and IP65 sealing

Reasons to avoid

−Bluetooth needs an optional adaptor
−UNI-T doesn't publish per-range resolution or burden voltage

Check price on Amazon →Price shown at retailer, may fluctuate.

#8Best Brymen for Electronics4.6★★★★★

EEVblog Brymen BM786

A 60,000-count Brymen with 0.01 µA and 0.01 Ω resolution and CAT IV 600V, for about a third of a Fluke 287.

Best for:Bench electronics and PCB repair

The BM786 is a Brymen meter made for the EEVblog: AC+DC True RMS, 60,000 counts, CAT III 1000V / CAT IV 600V, and 0.03% best DC voltage accuracy. Its 600.00 µA range resolves 0.01 µA at ±(0.075%+20 digits), and its 600.00 Ω range resolves 0.01 Ω. Brymen publishes a burden of 0.2 mV per µA, twice the BM235's, so in very low-voltage circuits it drops more voltage than you may expect. The BeepLit continuity responds in under 100 µs. It has no logging or PC link, but for hands-on bench work and PCB repair it's a strong all-rounder.

Why it fits: A 60,000-count meter with 0.03% best DC accuracy and CAT III 1000V, good for precise battery and charge-controller voltages on off-grid systems. It has no logging and no clamp, so it is a bench-and-van meter more than a string tester.

Accuracy: AC+DC True RMS, 0.03% DC V
Safety rating: CAT III 1000V / CAT IV 600V
Auto-ranging: Yes (manual override)
Best for: Bench electronics and PCB repair

Reasons to buy

+0.01 µA and 0.01 Ω resolution at 60,000 counts
+Fast latching BeepLit continuity (<100 µs)
+Relative zero, Max/Min/Avg and crest capture

Reasons to avoid

−0.2 mV/µA burden is higher than the BM235's
−No data logging or PC connection

Check price on Amazon →Price shown at retailer, may fluctuate.

#9Best Wireless HVAC Clamp4.5★★★★★

Fieldpiece SC480

An HVACR power clamp that measures watts and power factor, checks phase rotation and sends readings to the Job Link app.

Best for:HVACR techs who need power, phase rotation and app logging

The SC480 does more than a standard HVAC clamp. Besides 600 A AC, inrush, a 1000 µA DC range (0.1 µA) for flame sensors, capacitance to 10 mF and temperature from -58 to 2372 °F, it measures active power (W), VA, VAr and power factor, checks 3-phase rotation, and has a low-pass filter for VFD voltage. Readings go to the Job Link app over Bluetooth. It is CAT IV 600V / CAT III 1000V with a 10,000-count dual display, but it can't clamp DC current and the warranty is one year.

Why it fits: It reads 1000 V DC under CAT III 1000V, but its strength is the AC side: watts, power factor and phase rotation at the inverter output and service panel. The jaw reads AC current only, so it cannot measure string current.

Accuracy: True RMS
Safety rating: CAT IV 600V / CAT III 1000V
Auto-ranging: Yes (manual Range button)
Best for: HVACR techs who need power, phase rotation and app logging

Reasons to buy

+Watts, VA, VAr and power factor
+Phase rotation, inrush and VFD low-pass filter
+µA DC range and Job Link wireless

Reasons to avoid

−No DC amps through the clamp
−One-year warranty

Check price on Amazon →Price shown at retailer, may fluctuate.

#10Best Budget Meter for Electronics4.5★★★★★

UNI-T UT61E+

A budget 22,000-count True RMS meter with 0.01 µA and 0.01 Ω resolution, REL mode and a USB link.

Best for:Arduino, hobby electronics, PCB repair

The UT61E+ is UNI-T's 22,000-count version of the UT61+ series: True RMS, CAT III 1000V / CAT IV 600V, with a 220.00 µA range at 0.01 µA resolution and a 220.00 Ω range at 0.01 Ω (±0.5% + 10 digits). REL mode subtracts lead resistance, which UNI-T's manual tells you to do for low-ohm readings. It also adds capacitance to 220 mF, frequency to 220 MHz, hFE, NCV and a USB cable for PC readout. It has no temperature function (that's the UT61D+), and UNI-T doesn't publish its burden voltage.

Why it fits: A low-cost 22,000-count meter with 1000 V DC, CAT III 1000V and a 20 A range, fine for single panels and small off-grid arrays. It has no clamp or logging on the meter, only USB readout to a PC, so it ranks last for grid-tied strings.

Accuracy: True RMS, ±(0.05%+5) DC V
Safety rating: CAT III 1000V / CAT IV 600V
Auto-ranging: Yes (manual override)
Best for: Arduino, hobby electronics, PCB repair

Reasons to buy

+0.01 µA and 0.01 Ω resolution at a budget price
+REL mode to zero test-lead resistance
+USB PC link, capacitance to 220 mF, frequency to 220 MHz

Reasons to avoid

−No temperature measurement
−Burden voltage not published

Check price on Amazon →Price shown at retailer, may fluctuate.

Before you buy

Buying advice

Size the voltage rating for cold mornings

A module's Voc rises as its temperature falls, so a string that reads comfortably below a meter's limit in summer can exceed it on a frosty morning. Work out the string's cold-weather Voc from the module datasheet and pick a meter whose DC rating and CAT voltage sit above it. For 1500 V commercial arrays that narrows the field to the Fluke 393 FC.

Buy a DC clamp if you commission or service strings

Comparing string currents at a combiner is the quickest way to spot a damaged module or a loose connector, and it needs a DC clamp. Only two meters here clamp DC: the Fluke 393 FC and the KAIWEETS HT208D. HVAC and electrician clamps such as the Fieldpiece SC480 read AC current only, which suits the inverter output but not the array.

Use leads and probes rated for the system

A meter's CAT rating only protects you if the leads match it. For 1000 V strings use CAT III 1000V leads with shrouded tips; for 1500 V systems Fluke rates the 393 FC's leads at CAT III 1500 V DC. Replace leads with cracked insulation, and keep a set of MC4-compatible test adapters so you never have to strip a cable on site.

Add logging and temperature for diagnosis, not just commissioning

A single Voc reading tells you a string is alive. Logging voltage through a day, with module temperature alongside, shows whether a low reading tracks shading, heat or a fault. The Fluke 289 and UNI-T UT181A log on the meter, and the UT181A's twin thermocouple inputs can read module and ambient temperatures together.

Methodology

How we chose

We ranked these ten for PV testing: the DC voltage and CAT rating first, so the meter outlasts a string's cold-weather Voc, then DC current through a clamp, then logging, DC accuracy and toughness. Every figure comes from the maker's site, datasheet or manual; the ranking is desk research, and only the Fluke 87V carries our Hands-on Tested badge.

Specs from the sourceEvery spec is checked against the manufacturer's official product page or datasheet and the official Amazon listing. Where sources disagree, we say so.

Fit over feature countEach pick earns its place for a specific kind of buyer, and we name who should skip it, rather than ranking on spec-sheet length.

Owner feedback, cross-checkedWe look for patterns in verified-purchase reviews to catch reliability issues that spec sheets never show.

No sponsored picksWe earn mainly from Amazon affiliate commissions and may also show display ads from Google. No brand or advertiser can pay for a spot, a ranking or a badge, and ads never affect our picks.

Picks marked "Hands-on Tested" have been bought and tested by us; the rest are desk research. A pick only carries that badge once we have actually bought and tested that unit. More on how we research.

Questions

Frequently asked questions

What multimeter do I need to test solar panels?+

For a single panel or a small off-grid array, any meter with a 1000 V DC range and a CAT III 1000V rating will read open-circuit voltage safely. For grid-tied strings, add a DC clamp so you can read operating current without breaking a connector. Commercial 1500 V systems need a meter rated for 1500 V DC, such as the Fluke 393 FC.

How do I measure the open-circuit voltage (Voc) of a solar panel?+

Disconnect the panel or string from the charge controller or inverter with its isolator, set the meter to DC volts, and probe positive to positive and negative to negative at the connectors. Compare the reading with the label's Voc, allowing for temperature: cold panels read higher and hot panels lower. Our negative voltage guide explains what a minus sign means.

Can I measure solar panel short-circuit current with a multimeter?+

On one small panel, yes, if its label Isc is well below the meter's current rating: you connect the meter's amps input directly across the panel. Don't do it on strings, and never disconnect the leads while current flows, because the DC arc won't self-extinguish. A DC clamp across a short-circuit link is the safer professional method.

Is a 600V multimeter enough for solar panels?+

Only for small systems. Residential strings in the US are commonly designed up to 600 V, and Voc rises in cold weather, so a 600 V meter leaves no margin. Commercial strings run to 1000 V and utility arrays to 1500 V. Every meter on this list reads at least 1000 V DC, and only the Fluke 393 FC is rated for 1500 V.

Why do I need a DC clamp meter for solar work?+

Most clamp meters, including many HVAC and electrician models, only read AC current through the jaw. PV strings produce DC, so you need a Hall-effect DC clamp such as the Fluke 393 FC or KAIWEETS HT208D to compare string currents at a combiner box. Zero the clamp before each DC reading to remove offset.

How do I find a bad solar panel with a multimeter?+

Compare like with like. Measure each string's Voc at the combiner under the same sunlight; a string that reads one module's worth low points to a failed module or a shorted bypass diode. Then compare string currents with a DC clamp. Logging voltage across a day, as the Fluke 289 or UNI-T UT181A can, helps separate shading from failure.