Dr. Power II is a fully automated power supply tester that enables users to easily and quickly determine if a power supply is defective or not. Cutting overall troubleshooting time considerably. Oversized easy-to-read LCD display and audible alarm helps user determine the exact cause of the failure, if there is one. An indispensable tool for any PC enthusiast or gamer! Designed from the ground-up, it supports every ATX power supply available today up to ATX12V v2.3. Oversized LCD panel that accurately shows the value of each specific power rails (within one-tenth of a volt). Accurate voltage indicating for +12V/+5V/+3.3V/5VSB/-12V. Built-in output connector's diagnostic system, low-voltage, high-voltage, no voltage, PG alarm systems. Easily troubleshoots system failure due to unstable power supply. Built-in alarm system to identify user when the power supply demonstrates abnormal characteristic. ATX12V Power Supply Tester. Connectors 24-pin ATX Motherboard; 4-pin ATX12V Motherboard; 8-pin EPS12V Motherboard; 4-pin Peripheral Device; 6-pin PCI-E; 8-pin PCI-E; Serial ATA. Dimensions: 5.1" Height x 3" Width x 1" Depth.