Fluke 106 vs Fluke 107

Specs side by side

Specs checked against manufacturer documentation and official Amazon listings. Desk research, not bench testing. How we research.

Key differences

• →Fluke's 106/107 manual marks diode test, frequency and duty cycle as 107-only functions.
• →The 107's backlight is listed by Fluke; the 106 pages don't list one and its photo shows no backlight button.
• →Both have only 4A and 10A current ranges, with no milliamp or microamp ranges.
• →Neither meter is True RMS; Fluke positions the 106 for work where True RMS accuracy isn't needed.
• →Size, weight, CAT III 600V rating, the 6,000-count display and every shared accuracy figure are identical.

At a glance

Every difference between the Fluke 106 and 107

We went through both of Fluke's US product pages, spec tabs and the shared users manual line by line. These are all the differences we found, including the small ones that never make it into a feature list. Anything not in this table is the same on both meters.

That is the whole list: three measuring functions, two display conveniences and an accessory. The body, the CAT III 600V rating, the 11 A fuse, the 6,000-count display, battery life, every accuracy figure and even the input impedance (over 10 MΩ on volts, over 1 MΩ on AC millivolts) are shared. So is a limit Fluke footnotes on the 106 page: AC readings are specified only from 1% to 100% of range, so anything under 0.06 V on the 6.000 V AC range is outside the published accuracy on either meter.

Fluke 106 vs 107 spec by spec

Fluke prints one accuracy table for the pair and marks the 107-only rows. Read down the last column: every measurement the 106 makes, the 107 makes to exactly the same tolerance. The gap is functions, not quality.

The capacitance row hides a practical detail from the manual: let the reading settle for up to 18 seconds on large electrolytics, and expect up to 1.5 nF of floor on the 50 nF range from the leads themselves. Both meters share that behavior, so it doesn't tip the choice either way.

What frequency and duty cycle actually show you

Many modern loads are switched on and off thousands of times a second rather than fed a steady voltage: PC and HVAC fans, LED dimmers, small motor controllers and fuel injectors. Put a DC-volts probe on one of those signals and you get an average that tells you little. The 107's Hz and % modes read the switching rate and the share of each cycle spent on, which is what the controller is actually changing.

Worked example, not a measurement: a 4-wire PC fan's PWM input typically runs at about 25 kHz, well inside the 107's 100 kHz limit. If the 107 reads 40.0% duty and the fan still won't spin up, the controller is doing its job and the fan or its tach wiring is the suspect. On a 106 you would only see a fixed-looking DC figure and could not tell a 40% command from a stuck output. The manual also lets the 107 read frequency on its current input, handy for checking line frequency through a load. For a full fan procedure, see how to test a 4-wire fan motor with a multimeter.

Where each meter earns its place

The 106 is a capable wiring meter. Receptacle voltage, a blown cartridge fuse, a heater element's resistance, or the running current of a 5 A appliance on the 10 A range are all inside its reach, with the same tolerance the 107 would give. Where it runs out is semiconductors and switched signals. Without a diode range you can't confirm an LED, a rectifier or a flyback diode, and a resistance reading across a junction depends on a test voltage Fluke doesn't publish for the ohms ranges, so it proves little.

That matters most in three places: hobby electronics, car electrical work and appliance control boards. A car's alternator diodes, LED tail lights and PWM-driven fuel pumps all need either the diode range or the duty-cycle mode. If any of that is on your list, the 107 is the only one of the pair that helps; if your work stays on the mains side of the panel, the 106 loses nothing.

Fluke 106 or 107: which should you buy?

If you need True RMS readings on drives or LED drivers, step up instead: see Fluke 117 vs Fluke 107 or the best budget True RMS multimeters.

Value: what each step up actually buys

We don't quote prices, because they move weekly, but value can still be judged by what each tier adds and what it takes away. Count the measuring functions and the 106 has eight: AC volts, DC volts, AC millivolts, AC amps, DC amps, resistance, continuity and capacitance. The 107 has eleven, adding diode, frequency and duty cycle, and it gives up nothing to get them: the same 200 g body, the same tolerances, the same battery life.

That makes 106 to 107 the cleanest upgrade in Fluke's entry range, a pure addition. The next steps are trades rather than additions, which is why the ladder below says what you lose as well as what you gain.

The value case for the 106 is narrow but real. A second meter for a van or kitchen drawer, a meter for someone who will only ever check receptacles and batteries, or a shared tool where fewer modes means fewer mistakes: in those roles the three missing functions have no worth to you. Everywhere else, the cost of missing them is a second instrument, because there is no reliable workaround for a diode test or a frequency reading on a meter that lacks them. For the next step past the pair, see Fluke 15B+ vs Fluke 106.

What neither pocket Fluke does

• No milliamp or microamp ranges. The smallest current range is 4.000 A with 1 mA resolution, too coarse for standby draw or sensor loops. Our milliamp measuring guide explains what to use instead.
• Not True RMS. Fluke says so outright for the 107, and the 106 is positioned for jobs where True RMS isn't needed. Distorted waveforms can read high or low.
• No temperature, NCV or low-impedance mode. For those, look at the Fluke 17B+ (temperature) or the Fluke 117 (VoltAlert and LoZ).

Frequently asked questions