Description :   DC 4.5-30V 0-100A Dual LED Digital Ammeter Voltmeter Meter  Features :  1.The small size of the two-color dual instrument. Voltage and current can be displayed on the same screen at the same time 2.This instrument test voltage， current， power supply is taken from the test loop. No additional power supply 3.The the instrument test voltage supply range : DC4.5 ~ 30V，The reverse does not burn， Note : The maximum input voltage can not exceed 30V， otherwise there is the danger of burned 4.The instrument is equipped with three wiring. Convenient access to car \/ battery car \/ motorcycle car line，Used to monitor the battery voltage，Grasp the battery voltage state，can also be used for other products， the use of Voltage\/current measurement.  Specifications :   Technical parameters : Supply voltage : 4.5 30V (wide range) Test voltage : 0 ~ 100V; minimum resolution : 0.1V Test current range : 100A resolution : 0.1A (over 10A requires an external shunt)(connect with 100A\/75mV shunt) Does not include) Operating Current : &amp;lt;60mA Display : 0.28 &amp;quot;LED， two-color (red and blue) colors Dimensions : 48 &amp;times; 29 &amp;times; 21 mm Mounting cutout : 45.5 &amp;times; 26.5 mm Measurement rate : &amp;ge; 500mS \/ times Measurement accuracy : 1% (&amp;plusmn; 1 words) The minimum Operating voltage : +4.5 V Maximum working voltage : +30 V Operating temperature : -10 to +65 Operating Humidity : 10 to 80% (non-condensing) Working pressure : 80 ~ 106kPa Sun exposure : no direct exposure    <br>  <br> Measuring voltage range exceeds 30V， Please use a separate voltmeter Measuring the voltage is below 30V， the two voltages can be used together<br>  Package included :   1 x Digital Ammeter Voltmeter Meter  Details pictures :