... and the ratio mistake. Technical Specifications: Instrument Transformer Tester, Model ITC-C -Input: Power Frequency: 50Hz±0 ... 0 resolution 0.0001 ² Angle measure (°): 0.001 ~ 700.0, resolution 0.001 ² Resistance measure: (ohm): 0.0001 ~ 20 ... 5,7.5,10,15,20,25,30,40,50,60,75,80,100,120,150,160,200,250,300 ... current: 100A -Ambient Temperature: -20°C to 50°C -Meter accuracy class:1.0 -Timing range:0-999S ...