Fluke 115 Multimeter: Published Specs, CAT III 600 V Rating and What to Check
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The Fluke 115 is a compact true-RMS digital multimeter for field technicians and electricians who need reliable voltage, current and resistance readings in a small package. It is the smaller sibling of the 117 in Fluke’s electrician range, and it covers most everyday tasks: checking outlets, testing circuits, measuring fixture resistance and confirming current draw. This guide sets out the figures Fluke publishes for the 115 and explains what its safety rating means in practice.
Quick answer
The Fluke 115 is a true-RMS multimeter with a 6,000-count display. Fluke publishes DC voltage accuracy of ±(0.5% + 2), AC true-RMS voltage accuracy of ±(1.0% + 3) from DC to 500 Hz, resistance accuracy of ±(0.9% + 1) and AC current accuracy of ±(1.5% + 3) from 45 Hz to 500 Hz. Its current inputs take up to 10 A continuously and tolerate 20 A for 30 seconds. Fluke rates the meter CAT III 600 V, and it carries a three-year warranty.
How we chose these specs
Every figure in this article comes from Fluke’s own product pages for the 115, read on the US and Australian Fluke sites, plus Fluke’s safety guide for the explanation of CAT categories. We used no retailer listings, forum posts or search-result snippets for any value. Where the two product pages agree, we report the value once.
Published specifications
| Function | Published range and resolution | Published accuracy |
|---|---|---|
| DC volts | 6.000 V, 60.00 V, 600.0 V (0.001 V to 0.1 V) | ±(0.5% + 2 counts) |
| DC millivolts | 600.0 mV (0.1 mV) | ±(0.5% + 2 counts) |
| AC volts, true RMS | 6.000 V, 60.00 V, 600.0 V | ±(1.0% + 3 counts), DC to 500 Hz; ±(2.0% + 3 counts), 500 Hz to 1 kHz |
| DC amps | 6.000 A, 10.00 A | ±(1.0% + 3 counts) |
| AC amps, true RMS | 6.000 A, 10.00 A (45 Hz to 500 Hz) | ±(1.5% + 3 counts) |
| Resistance | 600.0 Ω to 6.000 MΩ | ±(0.9% + 1 count) |
| Resistance, high range | 40.00 MΩ | ±(5% + 2 counts) |
The display shows 6,000 counts and updates four times per second. Fluke’s current input is rated for 20 A for up to 30 seconds, and the meter is listed as CAT III 600 V with a maximum voltage of 600 V between any terminal and earth ground. Fluke also publishes a three-year warranty for the 115.
What CAT III 600 V means for this meter
Fluke’s safety guide describes CAT III as the environment of three-phase distribution, including switchgear, feeders and branch circuits in buildings. The 115’s CAT III 600 V rating therefore covers work inside distribution equipment, up to 600 V. It does not cover work at the utility service entrance or on outdoor conductors, which fall under CAT IV.
Fluke recommends choosing a meter rated for the highest category you might reach. For a home or light commercial electrician working inside panels and branch circuits, CAT III 600 V is a sensible match. For service-entrance work, the rating is not enough, and a CAT IV meter is the right tool.
Where the 115 fits
The 115 suits field technicians who move between sites and want a meter that fits a pocket or a small tool pouch. Its AC true-RMS voltage and current functions handle non-sinusoidal loads, and the 0.9% resistance accuracy is adequate for checking continuity paths, heater elements and motor windings. The 6,000-count display gives a clear reading on the bench or in a dim panel.
The meter is not designed for work above its ratings, and it is not a clamp meter. For current on live conductors you need a clamp. For measurements at higher voltage or in higher-category environments, look at a meter built for those conditions. Hobbyists who need only occasional battery and outlet checks may find a simpler meter more than enough.
Current measurement limits
The current inputs are the main limit of the 115. The published ranges top out at 10 A, with a 20 A overload allowed for 30 seconds. That is enough for checking the current draw of a small motor, a heater or an appliance on a bench supply. Put the meter in series with the load, not across the supply, and keep the leads in the correct current jacks before you switch the function. Connecting current leads across a voltage source can blow the fuse or damage the meter.
Voltage measurement habits that matter
Most readings on a 115 take only a few seconds, but the habits around them decide whether the reading is useful. Before you measure, set the function and range you need, and confirm the leads are in the right jacks. Many field errors come from leaving the meter in a current function and then connecting it across a live voltage. A quick check on a known source before and after the job confirms the meter is still responding correctly.
The 115’s voltage accuracy is stated as a percentage of reading plus counts. On a low reading, the count term is a larger share of the total, so a small voltage can carry more relative error than a large one. Use the lowest range that does not overload the reading, and note that auto-ranging changes the published figure. Fluke’s page lists a separate, looser AC accuracy for the auto-ranged 600 V setting, so check the range you actually use against the table.
Resistance readings need the circuit to be de-energized and isolated. Measuring resistance on a live circuit gives meaningless values and can damage the meter. Discharge capacitors before you measure across them, and disconnect the load where you can, so the reading reflects the component rather than the parallel path around it.
Buying checklist
- Confirm the CAT III 600 V rating matches the work. For service-entrance or outdoor conductor work, pick a CAT IV meter.
- Check that the 10 A current range is enough. For larger currents on live conductors, add a clamp meter to your kit.
- Look at the warranty. Fluke publishes three years for the 115.
- Keep the leads and fuse in good condition. A damaged lead changes the safety behavior of any meter.
- Store the meter in a holster or case so the display and jacks are protected on site.
Related guides
If you are deciding between meter types, read our guide to the best multimeter for DIY use for a lighter-duty comparison. For measurements where you cannot break the circuit, see our guide to the best AC clamp meter.
What we could not verify
Fluke’s 115 product pages list the specifications above, but the user manual and data sheet links on those pages were not readable in our session, so this article relies on the product page text. The pages we read do not list a non-contact voltage function for the 115, so we have not described one. Fluke’s pages also do not give a separate capacitance or frequency accuracy figure in the table we read, so we have not quoted those values. Where the pages give inconsistent footnote numbering, we used only the table values.
Frequently asked questions
Is the Fluke 115 rated for CAT IV work?
No. Fluke publishes the 115 as CAT III 600 V. Service-entrance and outdoor conductor work needs a CAT IV rated meter.
Does the 115 read AC current as true RMS?
Yes. Fluke lists AC current as true RMS from 45 Hz to 500 Hz, with a published accuracy of ±(1.5% + 3 counts).
How long is the warranty?
Fluke’s product page lists a three-year warranty for the 115.
Sources
- Fluke, “Fluke 115 True-RMS Digital Multimeter”, https://www.fluke.com/en-us/product/electrical-testing/digital-multimeters/fluke-115 (opened 2026-10-28).
- Fluke Australia, “Fluke 115 True-RMS Digital Multimeter”, https://fluke.com.au/en-us/product/electrical-testing/digital-multimeters/fluke-115 (opened 2026-10-28).
- Fluke, “Guide to digital multimeter safety”, https://fluke.com/en-us/learn/blog/safety/multimeter-guide (opened 2026-10-28).
