1、Easier Testing: Has DC ± 50V wide testing range under wide voltage power supply, and the voltage change will not affect the accuracy. 2、Simple Setting: The display scale and decimal point position can be set for easy comparison with the actual value, very convenient. 3、Better Display: Mainly used for small voltage analogue signal display, the voltage meter with 4 digit display enables clear viewing. 4、Reliable Using: With power supply reverse connection protection and input anti static protection, can work continuously for a long time. 5、Easy Carrying: Designed to have a compact size and a light weight as well, the simple carrying allows for indoor and outdoor working. Item Type: Voltmeter Product Model: Q02HO1A Power Supply: 5-24V DC, power<0.5W. Measuring Range: DC ± 50V. Input Impedance: 50K Ω Display Specification: 4 digit 0.56in red digital tube. Working Environment: Temperature 0-40 ℃, relative humidity<80%. Opening Size: Recommended opening size 76 x 40mm / 2.99 x 1.57in (approx.). 1 x Voltmeter