20pin - SERIES 20pin Power Supply Tester    FEATURES Turn-on your power supply Plug-in your 20 pin power supply connector to mini tester,Check LED light it ON or OFF Plug the HDD power connector to check if it passes or fails Plug the HDD power connector to check if it passes or fails Remove P4 connector and plug the Floppy power connector to check if it passes or fails 24pin - SERIES 24pin Power Supply Tester  FEATURES Turn-on your power supply Plug-in your 24 pin power supply connector to mini tester Check LED light it ON or OFF Plug the HDD con, check +12V, +5V Remove HDD, Plug p4(p6/p8)con, check +12V Remove p4(p6/p8)con, plug FLOPPY con, check +12V, +5V Remove Floppy con, plug SATA con, check +12V, +5V, +3.3V Do not plug wrong position when you use P4 connector 24pin LCD - SERIES 24 pin LCD Power Supply Tester  FEATURES Easy to check ATX power supply Aluminum case Accurate voltage indicator +/- 0.1V(+12V1/+5V/+3.3V/5VSB/+12V2/-12V) ATX P.G. value display Lower or higher P.G. values alarm ATX output connectors check Lower voltage detected alarm Over voltage alarm No voltage detected alarm         This product is designed only for power supply output tests. Do not leave it connected to the power supply unattended. It generates heat and could possibly damage your power supply.