... meters and verification system, to have corresponding output information is power inspection meter can realize the automatic verification, ... . Checking AC sample device error. The instrument type are the verification: AC/DC voltmeter, ammeter, single/three-phase active, reactive power meter, ... 7.5, 10, 15, 20, 25, 30. DC output capacity 30 W DC output adjusting scope and fineness • range 0 ~ 120% ...