Best Clipon Meter
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Quick answer: a clip-on meter, or clamp meter, reads current by clamping around one conductor, so you do not break the circuit. Among the listings in this search, three are true clamp meters: the Klein CL120 (400 A AC), the Fieldpiece SC260 (True RMS, with AC amps and volts) and the FNIRSI DMC-100 (600 A AC/DC). The FNIRSI has the highest listed current range. Listing figures were checked on 11 October 2026 and are shown as the sellers state them.
The three picks at a glance
| Clamp meter | Listed current range | Listed display | Best fit (as the listing describes it) |
|---|---|---|---|
| Klein Tools CL120 (B08CP6GL49) | 400 A AC | Auto-ranging, backlit | Electricians with a case and test leads |
| Fieldpiece SC260 (B00KLYJG78) | AC amps (range not stated) | True RMS, backlit | HVACR service in hot and cold conditions |
| FNIRSI DMC-100 (B0DP2L9CFR) | 600 A AC/DC | 2 inch color TFT, data curve | Automotive and RV DC systems, and logging intermittent faults |
How we chose these three
The search returned a mix of clamp meters, multimeters, kWh meters, a tape measure and a dirty-electricity meter. We kept only products whose listing describes a clamp for current. That left three. We excluded the tape measure, the Stetzerizer meter, which the listing describes as a dirty-electricity meter, and two kWh meters from the same search, because their listings describe energy metering rather than clip-on current. The figures below are from the listings, checked on 11 October 2026.
1. Klein Tools CL120 Digital Clamp Meter
The listing gives an auto-ranging 400 A AC clamp. It measures AC current through the clamp and AC and DC voltage, resistance and continuity through the test leads. It has a non-contact voltage (NCVT) function in the jaw, a backlit display, a max and data hold, and an auto power-off after 10 minutes. The package includes a carrying case, test leads with CAT III and CAT IV caps, and three AAA batteries. The listing gives a weight of 9.76 ounces and dimensions of 8.45 x 3.51 x 1.51 inches. Check the Klein CL120 on Amazon (checked 11 October 2026).
2. Fieldpiece SC260 Compact HVACR Clamp Multimeter
The listing describes a True RMS clamp with higher-accuracy VAC and AAC readings, plus temperature, capacitance and a backlight. It has non-contact voltage and amperage readings, a continuity warning and a diode test, and an auto-select mode that detects capacitance or resistance. A swivel magnet gives hands-free use. The listing says it is built for HVACR work in hot and cold environments, and it gives dimensions of 3.5 x 3 x 9.1 inches, so the body is about 3.5 inches wide. Its weight field reads 0.27 g, which cannot be right for a meter of this size, so check the box weight. Check the Fieldpiece SC260 on Amazon (checked 11 October 2026).
3. FNIRSI DMC-100 Clamp Meter
The listing gives AC and DC current up to 600 A, with TRMS measurement, voltage, resistance, capacitance, frequency and temperature. It has a 2 inch TFT color display with 10 brightness levels and a dark and light theme. It stores 8 sets of real-time data and 30 sets of history, and it records a curve for intermittent faults. It has a 1500 mAh battery charged by Type-C, and the listing gives dimensions of 7.7 x 2.91 x 1.14 inches and a weight of 6.72 ounces. The bullets note that voltage must be measured with the test leads, because the clamp jaws are for current only. The title says 9999 counts, but a bullet says 10000 counts, so check the count on the unit. Check the FNIRSI DMC-100 on Amazon (checked 11 October 2026).
Worked example: which clamp covers a 500 A load?
Take a 500 A AC load, such as a large feeder cable. The Klein CL120 is rated to 400 A, so 500 A is 100 A above its top range, or 25% over the limit, and it cannot read that load. The FNIRSI DMC-100 is rated to 600 A, so 500 A sits 100 A under its top range, which is about 83% of its maximum. The Fieldpiece SC260 listing does not state an AC current maximum, so it cannot be checked against this load. For loads above 400 A, the FNIRSI is the only one of the three with a stated range that covers 500 A.
What the listings do not say
None of the three listings gives a clamp jaw diameter or a maximum conductor size in the bullets. The Klein and FNIRSI listings give a current range, but the Fieldpiece listing does not. None of the listings states a battery life for continuous use. The FNIRSI listing’s data curve and storage figures are features, not an accuracy specification.
Frequently asked questions
Which clamp meter reads the highest current?
The FNIRSI DMC-100 lists 600 A AC and DC, which is more than the 400 A AC listed for the Klein CL120. The Fieldpiece listing does not state an AC current maximum.
Can a clamp meter measure voltage?
Yes, but not through the clamp on the FNIRSI listing. Its bullets say voltage must be measured with the test leads, and the clamp jaws are for current only. The Klein CL120 also reads voltage through its test leads.
Is a kWh meter the same as a clamp meter?
No. The two kWh meters in this search describe energy metering for RV pedestals and home panels. They are not clamp meters, so they are not in this list.
Does the Klein meter include batteries?
Yes. The Klein listing says it includes three AAA batteries, a carrying case and test leads with CAT III and CAT IV caps.
Which clamp meter suits HVAC work?
The Fieldpiece SC260 listing says it is designed for HVACR service in hot and cold environments, and it lists temperature, capacitance and a backlight. The listing does not give a current maximum, so check it against your load.
Conclusion
For a clamp meter with a stated current range above 400 A, the FNIRSI DMC-100 is the only one of the three that covers it. The Klein CL120 gives a case and a 400 A AC clamp for general electrical work. The Fieldpiece SC260 is the HVACR pick, though its listing leaves the current maximum unstated. For more on clamp meters, see best true rms digital clamp meter, best clamp tester fluke, and best handheld clamp.
Klein CL120 on Amazon · Fieldpiece SC260 on Amazon · FNIRSI DMC-100 on Amazon
