1、Compared with the pointer meter, it has the advantages of stable,clear and intuitive. 2、Widely used in digital accurate measurement and display. 3、Alternatives to ammeters, voltmeters, and frequency meters. 4、Automatic reset adjustment and automatic polarization exchange. 5、When the basic range is exceeded, it can be equipped with an external distributor or inductor; the commercial frequency meter samples the AC voltage signal. 1 x Meter2 x Green Module2 x Transparent Accessory1 x Users Manual Item Type:Multi-Function MeterWorking Voltage:220V+-10% 50HzAccuracy:+- 0.5%Screen: 0.5in Red LEDInput:AC220V 5ASampling Rate: 2.5 Times/sOut of Range: The leftmost digit is displayed as (+) or (-).Basic Range: 0~600V, internal step hop 0~5AWhen the input voltage signal is between 15V and 600V, the frequency measurement range is 30hz~ 99.99hz.