Condition: and high quality This mini digital LED voltmeter DC0-100V adopt 0.36inch digital display and ultra mini size with three wires, which designed with reverse connect protection function and used for all kinds of voltage measurement purposes. Measuring range:DC0-100V Minimum Input:DC 0V Net weight:20g Material: plastic Colour: Red Maximum Input:DC100V Display way:3 digits 0.36 inch LED nixie tube Refresh rate:500mS/time Power supply:DC3.0-30V Working temperature:-10 Celsius degree ~ 65 Celsius degree Dimension:23 x 15 x 10mm(without mounting plate) Cable length:Approx. 14.5cm Installing size:24 x 15mm Installing hole spacing:28mm Screw specification:M2.0x12 Self-tapping screw (not included) Note: If you are not electrical and electronic professional, the electrotechnical instrument is not suitable for you to assemble by yourself. Package Included: 4 x Digital Voltmeter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.