... DC voltmeter, and power meter. Besides, it can also calibrate frequency meter, phase meter, power factor meter, transducer, power load transformer ... 1A, 2.5A, 5A, 10A, 20A, with fine regulation 0.01%, each step has 20% allowance;3.3. ... voltage is the same, and add DC 75mV step;3.8. DC current and AC current is the ... same, and add DC 1mA step;3.9. DC voltage & current output wave≤1%;3 ...