A comprehensive studio kit shot of the Klein Tools CL390 AC/DC digital clamp meter. The package includes the True RMS multimeter with reverse contrast LCD, a set of red and black safety-rated test leads, a K-type thermocouple probe, three AAA alkaline batteries, and a heavy-duty black and orange zippered carrying pouch.
A product infographic for the CL390 AC/DC clamp meter highlighting its advanced diagnostic features. Text callouts specify its ability to measure 600V AC/DC, 400A AC/DC current, 40M Ohms resistance, and 200 microamps DC. Technical icons confirm a 2-meter drop protection, CAT III 600V safety rating, and a high-visibility reverse contrast display.
A direct front studio shot of the Klein Tools CL390 clamp meter. The professional device features a 1.6-inch jaw for AC/DC current measurement, a high-contrast reverse LCD showing a 4000-count digital readout, a multi-function rotary dial, and dedicated tactile buttons for Rel/Zero, Max/Min, and Data Hold.
An angled perspective shot of the CL390 digital multimeter against a white background. The image showcases the ergonomic orange side trigger for the clamp jaw, the high-visibility industrial housing, and the integrated non-contact voltage (NCV) sensor located at the top of the sensing jaw.
A back view of the Klein Tools CL390 highlighting the rugged industrial polymer construction. The image displays the printed safety warnings in English and French, the secure screw-down battery compartment, and the attachment slot for an optional magnetic hanger to allow for hands-free troubleshooting.
An angled studio shot showing the CL390 connected to its professional-grade test leads. The red and black silicone leads feature right-angle connectors and safety caps, emphasizing the meter's readiness for measuring voltage, resistance, and continuity in residential or industrial environments.
Action shot showing a technician using the CL390 clamp meter to measure DC current in an industrial setting. The technician, wearing heavy-duty insulated safety gloves, has the clamp jaw encircled around a thick orange conductor, while the reverse contrast LCD provides a clear real-time amperage reading.
Action shot of a professional using the CL390 in a large electrical cabinet. The technician is shown using the test leads to verify voltage at a busbar terminal while simultaneously monitoring the meter's display, illustrating the tool's versatility for complex electrical maintenance and diagnostics.
Klein Tools Clamp Meter Family promotional how to video
A comprehensive studio kit shot of the Klein Tools CL390 AC/DC digital clamp meter. The package includes the True RMS multimeter with reverse contrast LCD, a set of red and black safety-rated test leads, a K-type thermocouple probe, three AAA alkaline batteries, and a heavy-duty black and orange zippered carrying pouch.
A product infographic for the CL390 AC/DC clamp meter highlighting its advanced diagnostic features. Text callouts specify its ability to measure 600V AC/DC, 400A AC/DC current, 40M Ohms resistance, and 200 microamps DC. Technical icons confirm a 2-meter drop protection, CAT III 600V safety rating, and a high-visibility reverse contrast display.
A direct front studio shot of the Klein Tools CL390 clamp meter. The professional device features a 1.6-inch jaw for AC/DC current measurement, a high-contrast reverse LCD showing a 4000-count digital readout, a multi-function rotary dial, and dedicated tactile buttons for Rel/Zero, Max/Min, and Data Hold.
An angled perspective shot of the CL390 digital multimeter against a white background. The image showcases the ergonomic orange side trigger for the clamp jaw, the high-visibility industrial housing, and the integrated non-contact voltage (NCV) sensor located at the top of the sensing jaw.
A back view of the Klein Tools CL390 highlighting the rugged industrial polymer construction. The image displays the printed safety warnings in English and French, the secure screw-down battery compartment, and the attachment slot for an optional magnetic hanger to allow for hands-free troubleshooting.
An angled studio shot showing the CL390 connected to its professional-grade test leads. The red and black silicone leads feature right-angle connectors and safety caps, emphasizing the meter's readiness for measuring voltage, resistance, and continuity in residential or industrial environments.
Action shot showing a technician using the CL390 clamp meter to measure DC current in an industrial setting. The technician, wearing heavy-duty insulated safety gloves, has the clamp jaw encircled around a thick orange conductor, while the reverse contrast LCD provides a clear real-time amperage reading.
Action shot of a professional using the CL390 in a large electrical cabinet. The technician is shown using the test leads to verify voltage at a busbar terminal while simultaneously monitoring the meter's display, illustrating the tool's versatility for complex electrical maintenance and diagnostics.
Klein Tools Clamp Meter Family promotional how to video
KLEIN TOOLS

Klein Tools CL390 AC DC Digital Clamp Meter True RMS 400A Auto Ranging Multimeter Reverse Contrast LCD Measures Voltage DC Microamps Temperature NCVT

Only 2 left
SKU: CL390
$99.97

Description

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Professional Precision Diagnostics: The Klein Tools CL390 AC/DC True RMS Digital Clamp Meter

The Klein Tools CL390 is a high-performance diagnostic powerhouse designed for electricians and HVAC technicians who demand laboratory-grade accuracy in the field. Featuring advanced True Root Mean Square (TRMS) technology, this auto-ranging meter provides precise measurements for both AC and DC current up to 400A directly through the clamp. The standout feature is its high-visibility, reverse contrast LCD display, specifically engineered to remain crystal clear in the brightest direct sunlight or the darkest basement mechanical rooms. Whether you are troubleshooting solar arrays, certifying industrial control panels, or verifying DC battery systems, the CL390 delivers consistent, reliable data across a wide range of electrical parameters.

Engineered for versatility and jobsite safety, the CL390 integrates a non-contact voltage (NCV) tester into the clamp jaw for rapid circuit identification without physical contact. This multi-functional tool goes beyond current sensing, offering dedicated modes for DC microamps (perfect for flame sensor troubleshooting), capacitance, frequency, and diode testing. The inclusion of a K-Type thermocouple allows for immediate thermal analysis of climate control systems. Built to survive the rigors of industrial use, the CL390 is drop-tested to 6.6 feet and carries a CAT III 600V safety rating. With ergonomic side test lead storage and a ruggedized housing, it is the definitive choice for professionals maintaining residential, office, and light-industrial electrical systems.

Key Features

  • High-Visibility Reverse Contrast LCD: Delivers superior readability in all lighting conditions, from high-glare environments to low-light enclosures.
  • AC/DC Current Measurement: Measures up to 400 Amps AC and DC through the 1.6-inch clamp jaw for versatile circuit analysis.
  • True RMS Accuracy: Automatically ranging TRMS technology ensures precise measurements on both linear and non-linear electrical loads.
  • HVAC Specific Sensing: Features a dedicated DC microamp mode and K-Type thermocouple port for temperature measurement.
  • Integrated Safety NCVT: Non-contact voltage tester built into the jaw allows for safe, rapid detection of live AC voltage.
  • Industrial Durability: Rugged design is built to withstand a 6.6-foot (2m) drop and features double insulation safety protection.

What's Included

  • (1) CL390 AC/DC Digital Clamp Meter
  • (1) Set of Test Leads with CAT III/CAT IV Safety Caps
  • (1) K-Type Thermocouple Probe
  • (3) AAA Alkaline Batteries
  • (1) Soft Professional Carrying Case
  • (1) Instruction Manual

Specifications

Current Range 400A AC / 400A DC
Voltage Range 600V AC / 600V DC
Temperature Range -40° to 1832°F (-40° to 1000°C)
Resistance (Ohms) 40 MΩ
Capacitance 4000 µF
DC Micro-Amps 200 µA
Jaw Size 1.6 in (4.1 cm)
Safety Rating CAT III 600V
Drop Protection 6.6 ft (2 m)
Overall Height 1.5 in (3.8 cm)
Overall Width 3.5 in (8.9 cm)
Overall Length 8.45 in (21.5 cm)

Pro-Tip: When measuring DC current with the clamp, always use the "REL/ZERO" button before encircling the wire. Since DC measurements are sensitive to the Earth's magnetic field and internal circuit residuals, zeroing the meter in the specific orientation you will be testing ensures the highest possible accuracy for low-amperage DC troubleshooting.