S907D Automatic Distortion MeterDetailed product description：

S907D automatic distortion meter:
Distortion measurement is not affected by changes in the measured voltage, low-frequency interference, etc
Equipped with an external filter interface for expanding the measurement range

Fundamental frequency: 400Hz (or 315Hz), 1KHz
Distortion testing range: 0.03-30%
Accuracy: 10%
Voltage measurement range: 20HZ-100KHz, 30MV-100V