Klein Tools CL220 Digital Clamp Meter - Auto-Ranging TRMS Accuracy

In this review of the Klein Tools CL220 clamp meter, the bottom line is simple: this is a practical, no-nonsense meter for electricians and maintenance techs who need a single tool that covers current, voltage, resistance and temperature. The CL220 stands out because its clamp integrates a non-contact voltage detection option and True RMS auto-ranging in a compact package, so users get accurate readings across common jobsite tasks without juggling multiple meters.

Key Features

• Clamp current and NCVT: The integrated clamp jaw measures AC current up to 400 A while also providing convenient non-contact voltage detection for quick live-wire checks.
• AC/DC voltage and continuity: Test leads allow safe measurement of AC and DC voltage, resistance, and continuity for troubleshooting circuits and components.
• True RMS auto-ranging: TRMS technology with auto-ranging delivers more reliable readings on non-sinusoidal waveforms and saves time selecting ranges.
• Temperature measurement: The included thermocouple provides temperature readings, making the meter useful beyond basic electrical checks.
• Hands-free and visibility features: A backlit LCD improves readability in low light, and both a test lead holder and optional magnetic hanger support hands-free use.
• Complete kit: Comes with test leads with safety caps, thermocouple, carrying case and batteries so the meter is job-ready out of the box.

Who It's For

The CL220 is aimed at professional electricians, maintenance technicians, and skilled DIYers who require a versatile meter for everyday electrical diagnostics. Its combination of clamp current measurement, NCVT detection and TRMS accuracy makes it well suited for troubleshooting motors, branch circuits and mixed AC/DC systems.

Those who need extremely high-end lab accuracy, advanced logging over long periods, or specialized insulation resistance testing should look elsewhere; the CL220 is built for practical field use rather than laboratory-grade measurement and extended data acquisition.

Pros & Cons

Pros

• Wide measurement capability in one unit: clamp AC current, NCVT, AC/DC voltage, resistance, continuity and temperature.
• True RMS auto-ranging provides more accurate readings on complex signals compared with average-reading meters.
• Handy jobsite features like backlit LCD, test lead holder and included carrying case make it easy to use and transport.
• Good value for professionals who want a single dependable meter for routine electrical work.

Cons

• While generally accurate, some users report mixed results on very fine DC measurement tasks compared with dedicated lab meters.
• It is not designed for advanced data logging or high-precision laboratory measurements.

Specifications

Brand	Klein Tools
Clamp current	Up to 400 A AC
Voltage	AC and DC via test leads
Additional measurements	Resistance, continuity, temperature (thermocouple)
Measurement tech	Auto-ranging True RMS (TRMS)
Display	Backlit LCD
Included accessories	Carrying case, test leads with safety caps, thermocouple, 3 x AAA batteries, instructions

Our Verdict

The Klein Tools CL220 is a solid, work-ready clamp meter that combines TRMS accuracy and practical jobsite features in one affordable package. It is a smart buy for electricians and maintenance personnel who need reliable, versatile measurements without the complexity of lab instruments, offering strong everyday value and dependable build quality.

Frequently Asked Questions

Does the CL220 measure temperature?
The meter measures temperature using the included thermocouple probe for basic temperature checks.

Is non-contact voltage testing built in?
Yes, non-contact voltage detection is integrated into the clamp jaw for quick live-wire detection.

Does it include test leads and a case?
Yes, the CL220 ships with test leads that have safety caps, a carrying case, instructions and batteries so it is ready to use.