1. Computer Power Supply Tester 2. Voltage source: 20/24pin(ATX-connector) 3. Easy to install and use Computer Power Supply Tester Description: 1 ... ) Plug-in your 24 pin power supply connector to mini tester 3) Check LED light if ON or OFF (+5V, +12V ... , Check +12V, +5V, +3.3V * Specification 1) Voltage source: 20/24pin(ATX-connector) 2) Voltage test: +12V, +12V, +5V, -5V, +3.3V ...