... . WT104 is applicable for measuring AC,DC,AC&DC signals. 1. Function for AC, DC and AC&DC.2. 4 Display: V,A,W ... value.4. Auto range.5. Voltage: DC 600V/75V/35V AC 600V/75V/35V6. Current: DC 20A/2A/0.5A. AC 20A ... +0.1%range+1digit),0.5 class.11. RS-232-C communicate function..