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

AC Leakage Clamp Meter

M-310 Universal Clamp Tester40mmφCT and U type CT ACA

AC Leakage Current /Load Current
30/300mA, 30/300A, 40mmφCT and U type CT


The unique U type CT enabled to measure the load current of single or three phase cable without separating the cable to the wires.
Leakage current measurements with least affection from the external magnetic field.
Wide current measurements.(AC0.01mA-300A)
Measuring method Dual slope integration mode
Display 3.5 digit LCD, max. reading of 3200
Sampling 2 times/sec(Digital display)
12 times/sec(Bar graph display)
Low battery indication "Battery" mark on LCD
Over range indication "OL" mark on LCD
Data hold indication "DH" mark on LCD
Auto power off Approx. 10 minutes later after power on
Withstanding Voltage AC 2200V 1 minute max. (Between the core of CT and outer case)
Operating Temperature 0℃ to 40℃, 80%RH max. ( Without condensation )
Storage Temperature -10℃ to 60℃, 70%RH max. ( Without condensation )
Power supply 1.55V (SR-44, LR-44)×2
Power consumption 5mW
Battery life Approx. 50 hours(LR-44)
Size 64(W)×180(H)×21(D)mm
Weight Approx. 135g
Accessories Soft case:1
Instruction manual:1
Batteries LR-44(1.55V):2
Jaw opening capability 40mmφ
Range AC 0~30/300mA, 30/300A, 2range manual
Accuracy 23℃±5℃ 80%RH or less (50/60Hz)
AC 30/300mA/0.01mA/±1.2% rdg ± 5dgt
AC 30/300A/0.01A/0~200A : ±1.2% rdg ± 5dgt 200~250A : ±3.0% rdg ± 5dgt 250~300A : ±5.0% rdg ± 5dgt
U type CT
Max.size of conductor 20mmφ
Range AC 300A
Accuracy 23℃±5℃ 80%RH or less (50/60Hz)
Cable type/Resolution/Accuracy
Single phase IV cable/0.1A/Approx. ±5%
Parallel VVF cable/0.1A/Approx. ±5%
Three phase VVR cable/0.1A/Approximate value