Wrisky indicator Battery capacity digital LED Tester voltmeter 12v Acid lead batteries Capacity digital LED Tester voltmeter ; Work current:&lt; 5-15mA (with backlight);Energy resolution:1%;Voltmeter accuracy :1%;Using temperature range: -20- 70C . Operating humidity:10-80%; External dimension:482921 mm; Hole Dimensions :45.526.5 mm. With a shell, easy to use stand-alone or embedded in the panel on the product. Display Mode:Battery +voltage,Battery +Percentage. Note: This tester for Lithium and lead-acid batteries Universal ,the factory default setting for 24V lead-acid battery power and voltage cycle display,If you need to test other specifications can be re-set by yourself.