Product Detail ATX PSU each output connectors check Tests 20-pin and 24-pin power supplies Accurate voltage indicator +/-V(+12V1/+5V/+3.3V/5VSB/+12V2/-12V) ATX P.G value display. Blue LED Screen . The "PST-3 20/24 Pin Power Supply Tester" is best product for you. We recommended PST-3 20/24 Pin Power Supply Tester