KKmoon Two Wires Digital Frequency Panel Meter 10-199.9Hz LCD Electric Reading AC 80V - 300V Blue LCD digital frequency panel meter. Wide range of 10-199.9 Hz,Accuracy: 0.1Hz Voltage Range: 80V - 300V AC. Embedded installation, convenient to use. Note: The max measure voltage is AC 300V, please do not exceed AC300V, otherwise, the meter would be damaged.