Thermaltake Dr. Power II Automated Power Supply Tester Oversized LCD Supports All Power Supplies. Supports all ATX power supply up to ATX12V 2.3. Oversized LCD panel shows all voltages within 1/10th volt for quick and easy troubleshooting. Voltage reading for all rails (+12V/5V/+3.3V/5VSB/-12V) Built-in output connectors diagnostic system low-voltage high-voltage no voltage PG alarms. Built-in alarm to notify user of unstable or abnormal power supply activity. Easy to use troubleshooting system will quickly identify if power supply is the source of instability.