We specialize in Current Sensors, CT Sensors, and Measuring Instruments.

AC/DC Clamp Meter/Leakage Clamp Meter

M-290RMS AC/DC Mini Digital Clamp Tester (CE)30mmφCT, ACA, ACV/True rms, DCA, DCV, , Ω

AC/DC Current AC/DC Voltage Resistance
True rms reading (CE)


30mmφ CT window and ultra compact size.
Conform to IEC safety requirements.
True rms reading for ACA and ACV.
Data-hold function and auto power off.
Auto zero adjustment for DC current offset.
Withstanding Voltage AC 3700V 1 minute max. (Between the core of CT and outer case)
Storage Temperature -10℃ ~ 60℃ < 70%RH( without condensation )
Accuracy (23℃±5℃, 80%RH or less)
AC 40A/0.01A/±1.5%rdg±5dgt(50/60Hz)
AC 400A/0.1A/±1.5%rdg±8dgt(50/60Hz)
DC 40A/0.01A/±1.5%rdg±3dgt
DC 400A/0.1A/±1.5%rdg±5dgt
AC 60V/600V/0.01V/±1.0%rdg±8dgt
DC 60V/600V/0.01V/±1.0%rdg±6dgt
Operating Temperature 0℃ ~ 40℃ < 80%RH ( without condensation )
Power supply 1.5V (AM-4, LR03 or AAA)×3
Power consumption Approx. 9mA
Weight Approx. 135g
Measuring Range AC Current:40A/400A
DC Current:40A/400A
AC Voltage:60V/600V
DC Voltage:60V/600V
AC Conversion True rms responding
Safety standard IEC61010-1, IEC61010-2-032
Installation CategoryⅡ 600V or CAT Ⅲ 300V
Jaw opening capability 30mmφ
Limitation of circuit voltage Less than AC/DC 600V
Size 45(W)×180(H)×24(D)mm
Accessories Soft case:1
Instruction manual:1
Test lead:1
Crest factor < 2.5
Display 3.5 digit LCD max. reading of 3999
Over range indication "OL" mark on LCD
Data hold indication "DH" mark on LCD
Low battery indication "B" mark on LCD
Auto power off Approx. 10 minutes later after power on
E.M.C. standard EN 61326
Measuring method Dual slope integration mode
Sampling time 2 times/sec
Battery life Approx. 90 hours continuous
Polarity "-" sign for negative polarity
DC current zero offset By push button switch