... used instructions instrument, industrial frequency and DC digital instrument, transmitter and electric energy meter, etc. Checking AC sample device error. The instrument type are the ... wrong operation Many kinds of models the device preset portable instrument parameters, reduce the verification personnel the input workload. Standard ... .6, 0.75, 1, 1.5, 2, 2.5, 3, 4.5, 5,7.5, 10, 15, 20, 25, 30, 45 ...