AC/DC Digital Clamp Meter, Auto-Ranging 400 Amp


  • Test lead holder on side of clamp and optional magnetic hanger for meter (Cat. Nos. 69445 or 69417) for hands-free operation
  • Non-contact voltage tester integrated into the clamp jaw
  • High-visibility reverse contrast LCD display for improved view ability in all ambient lighting conditions
  • Automatically ranging true root mean squared (TRMS) measurement technology for accuracy
  • Measures AC Current and NCVT via a clamp, as well as AC/DC voltage, resistance, frequency, DC micro-amp, capacitance, duty cycle, diode test and continuity via test-leads, and temperature with a thermocouple
  • Measures temperature with a K-Type thermocouple probe
  • Max/Min, Rel/Zero and Data Hold capability
  • Auto Power-Off after 10 minutes to conserve battery life
  • Includes a carrying case, test leads with CAT III/CAT IV safety caps, thermocouple, instructions and 3 x AAA batteries
  • Low-battery indicator and easily accessible battery compartment
  • Built to withstand a 6.6' (2 m) drop
  • CAT III 600 V, Class 2, Double insulation safety rating
  • Meets requirements for use in basic and controlled electromagnetic environments such as residential, office and light-industrial locations

Klein Tools CL390 is an automatically ranging true root mean squared (TRMS) digital clamp meter. It measures AC/DC current and NCVT via the clamp, as well as AC/DC voltage, DC microamps, resistance, continuity, frequency, capacitance and diodes via test leads, and temperature via a thermocouple probe. It features a high visibility, reverse contrast LCD display that optimises visibility in both dark or bright ambient lighting.

AC/DC Current TRMS Clamp
Measures both AC/DC current and NCVT via a clamp, as well as AC/DC voltage, DC microamp current, resistance, continuity, frequency, duty cycle, capacitance and tests diodes via the test leads, and temperature with a thermocouple
Special Features:
Automatically Ranging True Root Mean Squared (TRMS) Measurement Technology for Accuracy; AC/DC Current Measurement; High Visibility Reverse Contrast LCD; NCVT
3 x AAA
Auto Shut Off:
Jaw Size:
1.6'' (4.1 cm)
Drop Protection:
6.6' (2 m)
4000 Count Reverse Contrast LCD
TRMS, AC/DC Current, NCVT, AC/DC Voltage, Resistance, DC Microamps, Frequency, Capacitance, Continuity, Duty Cycle, Diode Test and Temperature
600 V AC/DC
10 Hz to 60 kHz for 8 V to 220 V AC RMS
400 A AC/DC
4000 µF
Ohms (Resistance):
40 MΩ
AC Voltage:
600 V
DC Voltage:
600 V
DC Polarity Indicator:
DC Microamp:
200 µA
Temperature Range:
-40 °F-1,832 °F (-40 °C-1,000 °C)
CATIII 600V, Class 2, Double Insulation Safety Rating, CE Certified
Clamp Meter; Carrying Case; Instructions; Test Leads; Thermocouple; Batteries
Overall Length:
8.45'' (21.5 cm)
Overall Height:
1.5'' (3.8 cm)
Overall Width:
3.5'' (8.9 cm)
11 oz (314 g)
Additional Information
  • Read, understand and follow all instructions, cautions and warnings attached to and/or packed with all test and measurement devices before every use.
  • Do not attempt to measure resistance or continuity on live circuits.
  • Before every use, verify meter operation by measuring a known voltage or current.
  • Do not use the meter during electrical storms or in wet weather, and do not use the meter or test leads if they appear to be damaged.
  • Usage of this meter in any way other than that specified by the manufacturer can impair safe operations, resulting in severe injury or death.