Fluke 87V vs Fluke 179

Specs side by side

Specs checked against manufacturer documentation and official Amazon listings. Fluke 87V is hands-on tested by OhmSavvy; the Fluke 179 assessment is desk research. How we research.

Key differences

• →The 87V's basic DC accuracy is ±(0.05% + 1) against the 179's ±(0.09% + 2), per Fluke's specifications.
• →The 87V adds a 19,999-count high-resolution mode and captures peaks as short as 250 µs; the 179 stays at 6,000 counts.
• →The 87V reads frequency to 200 kHz and temperature from −200 °C; the 179 reaches 100 kHz and −40 °C to 400 °C.
• →The 179 includes Auto Hold and Min/Max-Average recording for intermittent readings.
• →Fluke quotes about 400 hours of battery life for the 87V against about 200 hours for the 179.
• →Both share CAT III 1000V / CAT IV 600V and a lifetime warranty, so safety and support are equal.

Accuracy and range, charted

On paper the gap is about precision and reach rather than safety. A lower DC accuracy figure means a reading closer to the true value; a higher frequency limit lets you check faster signals such as drive carrier frequencies.

What the accuracy gap means at real voltages

A percentage on a spec sheet is easier to judge once it becomes volts. The table applies each meter's published basic accuracy to four everyday readings, using the resolution of the range the reading lands on (0.01 V on the 60 V range, 0.1 V on the 600 V range, 0.01 Hz for frequency). This is worst-case arithmetic from Fluke's figures, not a test result; a meter in calibration is usually well inside its limits.

For checking that a 480 V feeder is within a typical ±5% utilization band (456 V to 504 V), a ±5 V window is perfectly usable, so the 179 does the job. The 87V's edge pays off when you're trending a small change, calibrating a 4-20 mA transmitter loop, or reading a DC sensor where 20 mV matters.

Why drive work favors the 87V

A variable-frequency drive doesn't output a clean sine wave. It switches the DC bus on and off thousands of times a second, varying the pulse width so the motor sees an average that rises and falls at the output frequency. A True RMS meter without filtering reads the energy of those fast edges too, which can push the displayed voltage well away from what the motor responds to. Fluke equips the 87V with a selectable low-pass filter, 3 dB down at 1 kHz, that strips the carrier so the reading tracks the fundamental. Fluke's 179 page lists no such filter.

The 87V's 200 kHz frequency limit and 250 µs peak capture belong to the same toolkit: one reads the carrier itself when you need it, the other catches the brief spikes that trip drives or reset controllers. On a fixed-speed motor or a resistive heater, none of this applies and the 179 reads the circuit just as well.

Fluke 87V vs 179 for industrial maintenance

A plant maintenance shift mixes very different jobs: verifying 480 V at a motor control center, chasing a drive that trips once a day, checking a 4-20 mA transmitter, taking a bearing or enclosure temperature, and confirming a fixed-speed motor is drawing sensible current. Both meters carry the same CAT III 1000V / CAT IV 600V rating, so neither limits where you may probe. What separates them is how many of those jobs each finishes without a second instrument.

Loop work shows how far the 179 actually goes. A 4-20 mA signal spans 16 mA, and the 179's 0.01 mA step is 0.0625% of that span, fine for confirming a transmitter is at 12 mA when it should be. The 87V's finer steps and ±(0.05% + 1) DC volts matter when you are trimming a transmitter or verifying a calibration, not when you are fault-finding a dead loop.

Drives are the clear dividing line. Most modern plants have dozens of variable-frequency drives, and the 87V's low-pass filter plus 250 µs peak capture let one meter read a drive's output properly and catch the transient behind a nuisance trip. The 179's Min/Max-Average will log a sag that lasts long enough to register, but Fluke lists no peak-capture mode or filter for it. On temperature, both cover typical maintenance readings such as motor frames, bearings and panel hot spots; the 87V's wider range only pays off with a suitable probe, since its supplied 80BK is rated −40 °C to 260 °C.

On ruggedness, the Fluke specifications we cite don't give an IP rating or a drop height for either meter, so we don't rank them on it. The 87V is the lighter meter on its own at 355 g, against 420 g for the 179, but rises to 624 g in its holster. When is the 179 enough? If your plant runs mostly fixed-speed motors, lighting, heaters and controls, and drive work goes to a specialist or a scope, the 179 does every job in this table except the drive rows, with the same safety rating and the same lifetime warranty.

Which should you buy?

Who each meter is built for

If neither needs CAT IV, compare the Fluke 117 vs Fluke 87V instead.

Frequently asked questions