Measuring range: DC 4.80V-30.0V; Power range: no additional power supply directly by measuring the voltage as the power range DC4.80V-30.0V; Maximum input: DC32.0V. Note: The input voltage is higher than 32V may permanently damage; Tolerance: 0.1% the decimal point is automatically shift; Measuring voltage> = 10.0V the measurement error is + / - 0.1V; Measuring voltage: <= 9.99V the measurement error is + / - 0.02V; Input impedance:> 100K Europe; Operating Current: <23mA; Refresh rate: about 300mS once; Display: three 0.36 "LED Digital Tube; Display color: red; Mounting holes: pitch: 28mm aperture: 2.8mm; Working temperature: -10~ 65'C.