Klein Tools CL390 AC/DC Digita...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.83
$99.97
Klein Tools CL390 AC/DC Digital Clamp Meter, Auto-Ranging 400 Amp

Klein Tools CL390 AC/DC Digital Clamp Meter Auto-Ranging 400 Amp TRMS with Temperature Measurement

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Model: CL390
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$192.83
$99.97
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Klein Tools CL390 AC/DC Digital Clamp Meter Auto-Ranging 400 Amp TRMS with Temperature Measurement

Professional True RMS Digital Clamp Meter with Advanced Measurement Capabilities

The Klein Tools CL390 delivers professional-grade electrical measurement with auto-ranging 400 amp AC/DC current capacity and True Root Mean Squared (TRMS) technology for accurate readings. This versatile digital clamp meter features CAT III 600V safety rating with double insulation, high-visibility reverse contrast LCD display, and comprehensive measurement functions including temperature measurement with K-Type thermocouple. Built to withstand 6.6-foot drops and designed for reliable performance in residential, office, and light-industrial environments.

Professional Features & Benefits

  • 400 Amp AC/DC Current Measurement: Auto-ranging TRMS technology provides accurate current readings up to 400 amps for comprehensive electrical diagnostics and troubleshooting.
  • CAT III 600V Safety Rating: Class 2 double insulation safety rating with CE certification ensures safe operation in demanding electrical environments up to 600 volts.
  • High-Visibility Reverse Contrast LCD: 4000 count display with reverse contrast technology delivers clear readings in all ambient lighting conditions for improved visibility.
  • Temperature Measurement Capability: Integrated K-Type thermocouple probe measures temperatures from -40� to 1832�F (-40� to 1000�C) for comprehensive system diagnostics.
  • Comprehensive Measurement Functions: TRMS AC/DC current and voltage, resistance up to 40 M�, frequency, capacitance up to 4000 �F, continuity, duty cycle, and diode test capabilities.
  • Rugged Construction: Built to withstand 6.6-foot drops with ABS housing and auto power-off after 10 minutes to conserve battery life for reliable field use.
  • Non-Contact Voltage Detection: Integrated NCVT in clamp jaw provides safe voltage detection without direct contact for enhanced safety during electrical work.

Technical Specifications

  • Ac Voltage: 600 V
  • Auto Power Off: Yes
  • Batteries: 3 x AAA
  • Capacitance: 4000 �F
  • Current: 400 A AC/DC
  • Dc Micro Amp: 200 �A
  • Dc Polarity Indicator: Yes
  • Dc Voltage: 600 V
  • Department: Electrical
  • Depth: 8.4500 in
  • Display: 4000 Count Reverse Contrast LCD
  • Drop Protection: 6.6' (2 m)
  • Frequency: 10 Hz to 60 kHz for 8 V to 220 V AC RMS
  • Height: 1.5060 in
  • Jaw Size: 1.6" (4.1 cm)
  • Material: ABS/Electronics
  • Ohms Resistance : 40 M�
  • Overall Height: 1.5" (3.8 cm)
  • Overall Length: 8.45" (21.5 cm)
  • Overall Width: 3.5" (8.9 cm)
  • Product Details: AC/DC Current TRMS Clamp
  • Product Function: TRMS, AC/DC Current, NCVT, AC/DC Voltage, Resistance, DC microamp, Frequency, Capacitance, Continuity, Duty Cycle, Diode Test, and Temperature
  • Product Group: Tool Sets
  • Product Subgroup: Tool Kits
  • Product Type: AC/DC Current TRMS Clamp
  • Product Voltage: 600 V AC/DC
  • Standard: CATIII 600V, Class 2, Double Insulation Safety Rating, CE Certified
  • Temperature Range: -40� - 1832�F (-40� - 1000�C)
  • Weight: 0.5160 lbs
  • Width: 3.5120 in

Professional Applications

  • Electrical Troubleshooting and Diagnostics
  • HVAC System Maintenance and Repair
  • Industrial Equipment Testing
  • Commercial Facility Maintenance
  • Residential Electrical Service
  • Motor and Drive System Analysis
  • Power Quality Assessment

Why Choose Klein Tools Quality?

Klein Tools delivers professional-grade reliability with CAT III 600V safety certification, Class 2 double insulation rating, and rugged construction built to withstand 6.6-foot drops. The comprehensive measurement capabilities, TRMS accuracy, and durable ABS housing ensure dependable performance for demanding electrical applications across residential, office, and light-industrial environments.

Manufacturer Resources

Spec Sheet

Product Specs

Ac Voltage:
600 V
Auto Power Off:
Yes
Batteries:
3 x AAA
Capacitance:
4000 µF
Current:
400 A AC/DC
Dc Micro Amp:
200 µA
Dc Polarity Indicator:
Yes
Dc Voltage:
600 V
Display:
4000 Count Reverse Contrast LCD
Drop Protection:
6.6' (2 m)
Frequency:
10 Hz to 60 kHz for 8 V to 220 V AC RMS
Jaw Size:
1.6" (4.1 cm)
Ohms Resistance:
40 MΩ
Overall Height:
1.5" (3.8 cm)
Overall Length:
8.45" (21.5 cm)
Overall Width:
3.5" (8.9 cm)
Temperature Range:
-40° - 1832°F (-40° - 1000°C)
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Multimeters
Product Type:
Clamp Meter
Product Voltage:
600 V AC/DC
Product Details:
AC/DC Current TRMS Clamp
Product Height:
1.5060 in
Product Material:
ABS/Electronics
Product Weight:
0.5160 lbs
Product Width:
3.5120 in
Product Depth:
8.4500 in

Klein Tools CL390 – Frequently Asked Questions

1) Can the CL390 measure DC amps, or is it AC only?
Both. The CL390 reads 400 A AC and DC through the jaw, with a DC polarity indicator so you can see current direction. It also has a 200 microamp DC range, which is what you need for HVAC flame rectification sensors on a furnace.
2) Is the Klein CL390 rated for work on a 480V three phase panel?
No. The CL390 is rated CAT III 600V with Class 2 double insulation and CE certification, and its voltage ranges top out at 600 V AC and 600 V DC. Line to line on a 480V system sits inside that, so it is within rating for 480V distribution work, but anything above 600 V or on a CAT IV service entrance is outside what this meter is built for.
3) Does the CL390 come with a temperature probe for HVAC work?
Temperature is built in as a function, read through a K-type thermocouple, with a range of -40 to 1832 degrees F (-40 to 1000 degrees C). That covers supply and return air splits, line temperatures, and flue gas on the high end.
4) Why pay for a TRMS clamp meter instead of an averaging one?
True RMS matters the moment you are reading current on anything fed by a VFD, LED driver, electronic ballast, or switching power supply. An averaging meter assumes a clean sine wave and reads low on distorted waveforms. The CL390 is TRMS on both current and voltage, so motor drive and modern lighting circuits read correctly.
5) Do I still need a separate non-contact voltage tester if I carry the CL390?
No, an NCVT is integrated into the clamp jaw, so you can sweep a conductor or receptacle for live voltage before you clamp or probe. One tool covers the go/no-go check and the actual measurement.
6) What can the CL390 test besides current and voltage?
Beyond 400 A AC/DC current and 600 V AC/DC, the CL390 covers resistance to 40 megohms, capacitance to 4000 microfarads, frequency from 10 Hz to 60 kHz (for 8 V to 220 V AC RMS), continuity, duty cycle, diode test, DC microamps, and temperature. Capacitance to 4000 uF is the one HVAC techs care about, since it covers typical run and start capacitors.
7) Is a 400 amp clamp meter enough for commercial building maintenance?
For most facility and MRO work, yes. The CL390's 400 A ceiling covers branch circuits, rooftop units, motor loads, and panel feeders in residential, office, and light-industrial settings. If you are regularly measuring main service conductors over 400 A, or working above 600 V, you want a higher-capacity clamp with a larger jaw than the 1.6 inch opening here.
8) What batteries does the Klein CL390 take, and will it drain sitting in the truck?
It runs on 3 AAA cells, and auto power-off shuts it down after 10 minutes idle, so a meter left switched on in a bag will not flatten the batteries overnight. Stock AAAs on the truck and you are covered.
9) Can I read the CL390 display in a dark electrical room or in direct sun?
The display is a 4000 count reverse contrast LCD, which keeps the digits legible in bright sun and in low light inside a panel room. Auto-ranging means you are not hunting for the right range with one hand on the jaw.
How fast can I get the Klein Tools CL390 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 CL390 come with a warranty?
Absolutely. The Klein Tools CL390 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 CL390?
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 CL390 from ZenSupply?
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