... 48VFrequency:94Hz,105Hz,111Hz,128Hz,AFC.Resistance:0.02Ω~300KΩ±(5%rdg+5dgt)3 Pole & 4 Pole WithVoltage:AC20/48VCurrent ... resistanceFrequency:94Hz,105Hz,111Hz,128Hz,AFC.Resistance:0.02Ω~29.99Ω±(5%rdg+5dgt)Test Short Current≤250mASoil ResistivityVoltage:AC20/48VFrequency: ... and FrequencyFrequency:16Hz~400Hz±1%rdg+2dgtCurrent:20mA~2A;±5%rdg+5dgtUSB2.0 interface Data StorageManually store 100 groupsPower ...