About This

2 in 1 AC voltage frequency meter - can automatically detect and display the accurate real-time voltage (V) and frequency (Hz) simultaneously
Universial volt Hz monitor - wide voltage measuring range AC 80-500V; frequency measuring range 45-65Hz; high working efficiency of 2 times/s measuring speed
Sensitive digital LED screen display - the small voltage dectector with a upgrade clear and bright LED display, better than LCD; Low working power consumption
Easy to use - 2 wires design, just connect directly with your device, it can test automatically, without extra power supply; can embedded buckle installation, more stable
Multifunctional application - Only suitable for Pure AC45-65Hz mains supply, can't be used for measuring circuit of square wave, inverter output and sine wave. (It can't be used for measuring the AC power converted from a DC power with an inverter); perfect for different modes of gasoline engine generator, diesel engine generator, motor and RV