Product: Relay Tester Produce Specification and Key Feature: 1, Relay detection 2, car battery test 3, Power supply: 12V car battery 4, Voltage Range: DC 5-16V 5, Support 12V on-board relay 6, Accuracy:+0.1V 7, Support 4/5 pin relays. 8, Detection of car battery (car not be started) 9, Automotive AC motor charging detection (car start)