Square&Round Type Moving Coil Frequency Meter Accuracy: Class1.0 Voltmeter:100V,220V,380V,440V. Frequency:45-55HZ,45-65HZ.... Square&Round Type ... Moving Coil Frequency Meter1. Model:SFT-80 ... . Accuracy: Class1.03. Specification: 1) Voltmeter: 100V 220V 380V 440V2) Frequency: 45-55HZ,45-65HZ,47-63HZ,57-63HZ,44-56HZ ...