Fluke 107 Multimeter: Specs, CAT III Rating and Uses

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The Fluke 107 is a palm-sized digital multimeter for everyday voltage, current, resistance, capacitance and frequency checks. The person typing “fluke 107” usually wants to know whether it is a safe and capable pocket meter for home, automotive and light electrical work, and where its limits lie. This post uses Fluke’s product page for the 107 and explains each figure. Work on mains wiring or service panels should follow the safety steps below, and panel work belongs to a licensed electrician.

Quick answer

Safety: CAT III 600 V, pollution degree 2, per Fluke’s IEC 61010-1 statement.
Voltage: AC and DC up to 600 V.
Current: AC and DC on 4 A and 10 A ranges, with an 11 A, 1000 V fuse.
Other functions: resistance to 40 MOhm, capacitance to 1000 uF, frequency to 100 kHz, and duty cycle.

What the Fluke 107 specification table says

Fluke’s product page for the 107 lists these ranges and accuracies. Fluke states that accuracy applies for one year after calibration, between 18 C and 28 C, and at 0% to 75% relative humidity.

AC voltage (40 to 500 Hz): 6.000 V, 60.00 V and 600.0 V ranges, accuracy 1.0% plus 3.
DC voltage: the same ranges, accuracy 0.5% plus 3.
Millivolt range: 600.0 mV, accuracy 3.0% plus 3.
AC current (40 to 200 Hz): 4.000 A and 10.00 A ranges, accuracy 1.5% plus 3.
DC current: the same ranges and accuracy.
Resistance: 400.0 Ohm up to 40.00 MOhm ranges, with accuracies from 0.5% plus 2 or 3 to 1.5% plus 3 on the highest range.
Capacitance: 50.00 nF up to 1000 uF. Accuracy is 2% plus 5 on the nF ranges and 5% plus 5 on the uF ranges.
Frequency (10 Hz to 100 kHz): accuracy 0.1% plus 3.
Duty cycle: 1% to 99%.

The display has 6000 counts. Fluke lists two AAA batteries with at least 200 hours of life, and a weight of 200 g. The page also states that the current input is protected by an 11 A, 1000 V fast-melting fuse that must be replaced only with a Fluke designated part.

Reading the CAT rating

The 107 is rated CAT III 600 V. Fluke’s safety guide describes CAT III as fixed distribution equipment, such as switchgear, feeders and larger lighting circuits, and CAT II as single-phase loads on receptacles, such as appliances and portable tools. Fluke advises choosing a meter rated for the highest category you could reach. A household outlet or appliance check is well within the 107’s rating. A service panel, meter base or utility connection needs a CAT IV-rated meter, and the 107 is not rated for those points.

True-RMS and waveforms

The Fluke product page we opened does not describe the 107 as True-RMS, so treat its AC readings as basic AC measurements. Fluke’s guidance says most homes have near-sinusoidal AC, and average-responding readings are often adequate there. Distorted waveforms from variable frequency drives, switching power supplies and some electronic loads can read less reliably on a basic meter, so use a True-RMS meter for those jobs.

Practical uses

Checking outlet, fixture and appliance voltage within the 600 V range and category.
Measuring AC or DC current up to 10 A, with the leads in the current jacks, in series, and the fuse in good condition.
Testing a car battery at rest and checking charging voltage on DC ranges, with safe battery handling.
Measuring resistance, continuity and diode behavior on wiring, fuses and components with the power off.
Checking capacitors up to 1000 uF after discharging them.

Because the current ranges stop at 10 A, the 107 is not suited to large feeder or motor current. A clamp meter with a higher range is the right tool there.

Safety steps

Confirm the CAT III 600 V rating and match your leads to it.
Check the fuse and the leads before you measure current, and never bypass the fuse.
Select the function and range before connecting the probes to the circuit.
Test on a known source before relying on a reading.
Keep fingers behind the probe guards, and do not work alone on energized equipment.

Disconnect and handle car batteries safely. Do not take readings on airbag or high-voltage hybrid or EV systems with a basic meter.

Common mistakes with a handheld meter

Measuring current with the probes still in the voltage jacks. This can blow the 11 A fuse or damage the meter, so move the red lead to the current jack before you test.
Replacing the fuse with a non-designated part. Fluke’s page says the fuse must be a Fluke designated part, and the 11 A, 1000 V rating must be respected.
Measuring current on a circuit that can deliver more than the 10 A range. Above the range, use a clamp meter or a meter with a higher range.
Assuming a basic AC reading is exact on a drive or electronic load. Fluke’s guidance says True-RMS is the more reliable choice on distorted waveforms.

Checking the jack, the function, the fuse and the range before you connect the probes prevents most handheld-meter damage.

The 107 suits people who want one palm-sized meter for household and light automotive checks, with current capability that the 101 does not offer. Its 10 A ceiling and its basic AC function set the boundaries, so match the job to those numbers before you buy.

How we chose

This post is based on Fluke’s product page for the 107, plus two Fluke learning articles on CAT categories and True-RMS measurement. We did not rank the 107 against other pocket meters, and we did not claim any result from using it. The figures are reported as Fluke lists them.

What we could not verify

The page we opened does not give a True-RMS statement for the 107, so its AC accuracy on distorted waveforms is not confirmed here.
The current ranges stop at 10 A, which the page we opened lists as the upper limit.
The page we opened does not list a physical size in a clear form, so this post omits dimensions.
The product link below points to a listing whose title names the 107; check the model on the listing before buying.

FAQ

Is the Fluke 107 rated for household mains?

It is rated CAT III 600 V, which covers many building circuits. Household checks are within that rating, but service panels need a CAT IV meter.

What is the maximum current?

The current ranges are 4 A and 10 A, for both AC and DC, per Fluke’s table.

What fuse does it use?

An 11 A, 1000 V fast-melting fuse, which Fluke says must be a Fluke designated part.

Does it measure capacitance?

Yes, from 50.00 nF up to 1000 uF, with the accuracy figures above.

How long do the batteries last?

Fluke states at least 200 hours on two AAA batteries.

Bottom line

The Fluke 107 is a sensible pocket meter for voltage, current up to 10 A, resistance and capacitance on household and light automotive work, with CAT III 600 V safety. For higher current, CAT IV points or True-RMS on distorted waveforms, choose a different meter.

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Internal links

For a broader view of Fluke options, read the Fluke multimeter lineup and the Fluke clamp tester guide.

Sources

Fluke, Fluke 107 Palm-Sized CAT III Digital Multimeter product page, https://www.fluke.com/en-id/product/electrical-testing/digital-multimeters/pocket-107 (opened)
Fluke, When Do You Actually Need a True-RMS Multimeter?, https://www.fluke.com/en-us/learn/blog/digital-multimeters/when-do-you-need-a-true-rms-multimeter (opened)
Fluke, Guide to digital multimeter safety, https://www.fluke.com/en-ie/learn/blog/safety/multimeter-guide (opened)