Field meter tester able to check 48 different wrong wiring connection ... electronic or mechanical meter can be tested, directly measure voltage, current, frequency, phase, power factor at work site3) Energy ... 100A (200A, 500A, 1,000A) is optional4) Voltage, current and power measurement accuracy: 0.05%5) Phase measurement accuracy ... : 30 - 80% MT3000D Portable field Energy Meter Multifunctional tester