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Parameters: Testing range: AC 60-500V two-wire access Min input: AC 60V(meter will not test accurately or not display when less than AC 60V) Max input: AC 500V(meter will burn when more than 500V) Refresh rate: about 200mS/time Accuracy: 1% (+/- 1 digit) Power consumption: about 5 to 15mA when less than 20mA Power supply: AC 75-300V (with the input common-line) Operating temperature: -10 °c to 65 °c Power supply: requires no power supply Display: three 0.56" LED digital tube Dimensions: 70x40x17mm (L x W x H) Notes: 1.There is super-high voltage in back of the circuit board. Hence, please do not touch circuit board or its components. 2.Please don't use the meter for electronic speed control, SCR dimmer and SCR voltage regulator, UPS or other high-frequency components Package includes: 1 PCS Digital Voltmeter