Features:<br />* 0.56''LED Digital Tube Wire DC 4.50-30.0V Voltmeter can be connected directly for measuring voltage<br />* You can use this meter to monitor voltage or battery of cars・ vehicles・ sailboat・ RV・ truck・ race car・ automotive・ etc.<br />* With reversed connection protection・ this item will not burn even when connected reversely ・ but its screen will display nothing<br />* Power supply range: No additional power supply ・ directly use the measured voltage as a power supply( the voltage range as above)<br />* The highest input is DC30.0V. <br />* The input voltage higher than 30V may be permanently damaged! <br />* With only two wires(the red and the black)・simply connect the red to positive and black to the negative<br />* Its strong plastic case prevents it from easily damaged by outer force<br />* High-quality LED is adapted in this item・ which is bright even in dim light<br /><br /><br />Specifications:<br />* Measuring range: DC4.50-30.0V<br />* Allowable error :   1%<br />greater than or equal to 10V・ the error is   0.3V<br />less than 10V・ the error is   0.10<br />* Input impedance : > 100K ohms<br />* Operating current: <23mA<br />* Refresh speed: about 300mS /times<br />* Display mode: three 0.56" LED digital tube<br />* Display color: Red/Blue/Green (as pictures show)<br />* Lead length: approx 20 cm / 7.87 inch<br />* Dimensions: approx 48 x 29 x 22 mm / 1.89 x 1.14 x 0.87 inch<br />* Opening size: approx 46 x 27 mm / 1.81 x 1.07 in