Field meter tester able to check 48 different wrong wiring ... and current range selection5) Measure low voltage and current transformer (CT) ratio online6) Harmonic analysis (2 - 21 times) at worksite ... 100V, 200V, 400V3) Current: direct measure: 1A, 5A, clamp transformer 100A (200A, 500A, 1,000A) is optional4) Voltage, current ... 30 - 80% MT3000D Portable field Energy Meter Multifunctional tester