Klein Tools Digital Clamp Mete...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$148.87
$92.68
Klein Tools Digital Clamp Meter, AC Auto-Ranging 400 Amp with Temp

Klein Tools Digital Clamp Meter AC Auto-Ranging 400 Amp TRMS Temperature NCVT 600V

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Model: CL220
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$148.87
$92.68
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Klein Tools Digital Clamp Meter AC Auto-Ranging 400 Amp TRMS Temperature NCVT 600V

Professional-Grade True RMS Clamp Meter with Temperature Measurement

The Klein Tools Digital Clamp Meter delivers professional-grade electrical measurement performance for comprehensive AC current testing and temperature monitoring. This True RMS clamp meter features auto-ranging technology and integrated NCVT designed for electricians, linemen, and electrical professionals, providing the reliable performance and industry-leading quality that tradesmen demand from America's most trusted tool manufacturer.

Professional Features & Benefits

Advanced Measurement Technology

  • True RMS Auto-Ranging - Delivers accurate measurements on non-linear loads with Klein's precision engineering for professional electrical diagnostics
  • 400 Amp AC Current Capacity - Handles high-amperage applications with 1.6-inch jaw opening for large conductors and cable bundles
  • Integrated NCVT Detection - Non-contact voltage testing built into clamp jaw provides safe voltage detection without test lead contact
  • K-Type Thermocouple Temperature - Measures -40° to 1832°F temperature range for comprehensive HVAC and electrical system diagnostics

Safety and Durability Standards

  • CAT III 600V Safety Rating - Class 2 double insulation protection meets rigorous safety standards for electrical work environments
  • 6.6-Foot Drop Protection - Rugged ABS construction withstands jobsite impacts and harsh working conditions with Klein quality durability
  • Backlit LCD Display - 2000-count display with backlighting ensures clear readings in low-light electrical panels and confined spaces

Professional Convenience Features

  • Auto Power-Off Function - 10-minute automatic shutdown conserves battery life during extended troubleshooting sessions
  • Data Hold and Max Value - Captures and holds readings for documentation and analysis of electrical system performance
  • Complete Professional Kit - Includes carrying case, test leads with safety caps, thermocouple probe, and batteries for immediate field use

Technical Specifications

Measures 400A AC current, 600V AC/DC voltage, 20 MΩ resistance, continuity, and temperature -40° to 1832°F. Overall dimensions 8.45" length x 3.51" width x 1.51" height, weighing 0.61 lbs. Features 1.6" jaw capacity, 2000-count backlit LCD display, powered by 3 AAA batteries with low battery indicator and auto power-off.

Installation & Usage

  1. Verify meter operation by testing known voltage source before each use following Klein Tools safety protocols
  2. Select appropriate measurement function using rotary switch for current, voltage, resistance, or temperature testing
  3. For current measurement, open clamp jaw and position around single conductor ensuring complete jaw closure
  4. Use NCVT function by positioning clamp near energized conductors for non-contact voltage detection
  5. Connect test leads to meter and circuit points for voltage, resistance, and continuity measurements
  6. Attach K-type thermocouple for temperature measurements in HVAC and electrical equipment diagnostics

Professional Applications

Ideal for:

  • Electrical Installation - Current measurement and load analysis in residential, commercial, and industrial electrical systems
  • Motor and Equipment Testing - Troubleshooting motor current draw, compressor amperage, and electrical equipment performance
  • Panel and Circuit Analysis - Branch circuit loading, main service current monitoring, and electrical system diagnostics
  • HVAC System Diagnostics - Temperature measurement and electrical testing of heating, cooling, and ventilation equipment
  • Industrial Maintenance - Preventive maintenance current monitoring and temperature analysis of industrial electrical systems
  • Telecommunications Work - Current measurement and voltage testing in communication and data system installations
  • Automotive Electrical - Battery, alternator, and electrical system testing with temperature monitoring capabilities
  • Solar and Renewable Energy - DC voltage measurement and current monitoring in photovoltaic and alternative energy systems

True RMS Technology Advantage

Klein Tools True RMS measurement technology provides accurate readings on non-linear loads including variable frequency drives, electronic ballasts, and switching power supplies. This advanced measurement capability ensures precise diagnostics on modern electrical systems with distorted waveforms, delivering the accuracy electrical professionals require for proper system analysis and troubleshooting.

Why Choose Klein Tools Quality?

Since 1857, Klein Tools has maintained America's legacy of excellence in electrical tool manufacturing, combining precision engineering with rigorous safety testing protocols. This digital clamp meter represents Klein's commitment to professional-grade reliability, featuring robust construction, accurate measurement technology, and comprehensive safety certifications trusted by electricians and electrical professionals nationwide for critical electrical system diagnostics.



KLN-CL220 - spec sheet

Manufacturer Resources

Product Specs

Ac Voltage:
600 V
Application:
Measures AC Current and NCVT via Clamp and AC/DC Voltage, Resistance, and Continuity via Test-leads, and Temperature with Thermocouple
Auto Power Off:
Yes
Batteries:
3 x AAA
Current:
400 A AC
Dc Polarity Indicator:
Yes
Dc Voltage:
600 V
Display:
2000 Count Backlit LCD
Drop Protection:
6.6' (2 m)
Included:
Digital Clamp Meter; Carrying Case; Instructions; Test Leads; Thermocouple; Batteries
Jaw Size:
1.6" (4.1 cm)
Ohms Resistance:
20 MΩ
Overall Height:
1.5" (3.8 cm)
Overall Length:
8.45" (21.5 cm)
Overall Width:
3.5" (8.9 cm)
Standard:
CATIII 600V, Class 2, Double Insulation Safety Rating, CE Certified
Temperature Range:
-40° - 1832°F (-40° - 1000°C)
Product Type:
Auto Ranging TRMS Clamp with Temperature
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Environmental Meters
Product Voltage:
600 V AC/DC
Product Function:
TRMS, AC Current, NCVT, AC/DC Voltage, Resistance, Continuity and Temperature
Product Details:
Auto Ranging TRMS Clamp with Temperature
Product Height:
1.5060 in
Product Material:
ABS/Electronics
Product Category:
Clamp Meters
Product Weight:
0.6130 lbs
Product Width:
3.5120 in
Product Depth:
8.4500 in

Klein Tools CL220 – Frequently Asked Questions

1) Will the Klein CL220 clamp meter fit around a 1-inch service entrance conductor or a bundled cable?
Jaw opening on the CL220 is 1.6 inches (4.1 cm), so it goes around single conductors up to that diameter, including large feeders and small cable bundles. Anything fatter than 1.6 inches, like a big parallel-run feeder or a full service entrance set, will not close in the jaw. Remember the clamp reads AC current on one conductor at a time; clamping a two-wire cable with hot and neutral together cancels out and reads near zero.
2) Can the Klein CL220 measure DC amps?
No. Current measurement on the CL220 is AC only, up to 400 A. Voltage is where it does both, 600 V AC and 600 V DC, through the test leads. If you need DC amperage on a solar string or a battery circuit, this is the wrong meter and you want a Hall-effect DC clamp instead. The CL220 does carry a DC polarity indicator, so it will tell you when you have the leads backwards on a DC voltage reading.
3) Is the Klein CL220 rated for work inside a commercial panel or at the service?
CAT III 600V is the rating, with Class 2 double insulation and CE certification. That covers branch circuits, distribution panels, and feeders inside a building at 600 V and below. It does not cover CAT IV work, so keep it off the line side of the service entrance and off utility drops. Housing is ABS with electronics inside, rated to survive a 6.6 foot (2 m) drop.
4) Does the Klein CL220 come with the thermocouple probe or is that a separate purchase?
Everything needed is in the box: the clamp meter, a K-type thermocouple probe, test leads, batteries, a carrying case, and instructions. Nothing else has to be ordered to start using it. The K-type probe reads -40 to 1832 degrees F (-40 to 1000 degrees C), which covers supply and return air, refrigerant line temps, and hot equipment surfaces on the HVAC side.
5) Do I need a True RMS clamp meter for VFD and electronic ballast circuits?
Yes, and that is what separates the CL220 from an averaging clamp. True RMS reads correctly on distorted waveforms, which is what you get from variable frequency drives, electronic ballasts, and switching power supplies. An averaging meter can be off by a wide margin on those loads. On a clean sine wave, a motor running direct across the line, either type reads about the same. If most of your work is drives, LED drivers, or anything with electronics on the load side, True RMS is the one to buy.
6) Can the Klein CL220 check for live voltage without touching the wire?
NCVT is built into the clamp jaw, so you hold the nose of the meter near an energized conductor and it detects voltage with no test lead contact. That saves carrying a separate pen tester for the first-pass check on whether a circuit is dead. Use it as an indicator only, then confirm with the leads on a known live source before and after, per the verification step Klein calls for.
7) Can I use the Klein CL220 for continuity and ohms testing on control circuits?
Resistance and continuity both run through the test leads, with resistance measuring up to 20 megohms. That is enough range for checking motor windings, thermostat and control wiring runs, heating elements, and ringing out a cable pair. Continuity gives you the audible go/no-go for tracing conductors. Do the resistance work de-energized; the ohms function is not for live circuits.
8) Is the display on the Klein CL220 readable inside a dark panel or crawlspace?
The LCD is backlit and reads to 2000 counts, so it stays legible in an unlit panel, a mechanical room, or under a house. Auto-ranging means you are not turning a knob to hunt for the right scale while holding a clamp around a live conductor. Data hold freezes a reading you took in an awkward spot so you can pull your hand out and then read it, and max value captures inrush or peak draw while you watch the motor instead of the screen.
9) Do I need a separate temperature meter for HVAC work if I carry the Klein CL220?
Not for most of it. The K-type thermocouple that ships with the CL220 covers -40 to 1832 degrees F, which spans refrigerant line temperatures, supply and return air, and flue and heat exchanger surface temps in the same instrument you are using to read compressor amps. Where it will not substitute is anything needing non-contact IR readings or simultaneous dual-probe delta-T, since this takes one contact probe at a time.
10) What is the exact model number to order for the Klein 400 amp TRMS clamp meter with temperature?
Klein Tools CL220 is the part number. It is the auto-ranging True RMS clamp with temperature: 400 A AC current, 600 V AC and DC, 20 megohm resistance, continuity, NCVT, and K-type thermocouple temperature. That combination of temperature plus NCVT in one body is what distinguishes CL220 from the neighboring Klein clamp meters, so specify the number rather than describing it if you are standardizing across a crew.
11) Is a 400 amp clamp meter enough for a commercial panel, or should I get a higher range?
400 A AC covers branch circuits, most feeders, motor and compressor loads, and main service current on residential and light commercial gear. Where the CL220 runs out is a main larger than 400 A, or a conductor too fat for the 1.6 inch jaw, whichever you hit first. On big services, the jaw size is usually the limit before the amperage is. For those, a flexible current probe style meter is the right tool.
12) What size batteries does the Klein CL220 take, and will it drain them sitting in the truck?
Three AAA batteries run the CL220, and they ship in the box. Auto power off shuts the meter down after 10 minutes idle, so a meter left switched on in a bag is not going to eat a set overnight. A low battery indicator tells you when the readings are about to go unreliable. AAA cells are stocked anywhere, which matters if you are standardizing meters across a maintenance crew.
How fast can I get the Klein Tools CL220 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools CL220 come with a warranty?
Absolutely. The Klein Tools CL220 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools CL220?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools CL220 from ZenSupply?
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