Specification: DC Voltage Meter with DC3.2-30V range. It is easy to read, install and use. And it is self-powered version and supports Reverse polarity protection. When the voltage is under 10V, there will 2 readings after decimal point, which mean the accuracy is 0.01 when it is under 10V; when it is above 10v, the accuracy is 0.1. No power supply needed Type: Digital Voltmeter Measure Voltage: DC 3.2-30V Two-wire Access Display: LED Digital Display Highest Input: DC 30V (higher than 30v, it has the risk of burn up) Minimum Input:DC 3.2V (below than 3.2V, measurement is inaccurate or does not show) Minimum Resolution: 0.01V(10V) Resolution:1%±1digit Current Consumption: < 20mA LED Color: Red Shell Color: Black Size (L x W x H): 48mm x 29mm x 22mm/1.89" x 1.14" x 0.87" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Digital Voltmeter