Test computer power supplies with this simple PSU tester. An essential tool for every computer technician. Note: some inexpensive power supplies do not provide -12 V output. Use this tester to quickly diagnose or rule out power supply issues, one of the first things to check when diagnosing computer problems. Key benefits - Easy to use and fast: quickly verify that a power supply is delivering the needed outputs and operating correctly. - Helps identify power related problems early, reducing troubleshooting time. - Highlights when a PSU omits -12 V output, preventing misdiagnosis. Use scenarios - Build or upgrade: test a new power supply before connecting it to the motherboard and components. - Troubleshooting: diagnose a computer that fails to boot or restarts unexpectedly to determine if the power supply is the cause. - Verification: inspect a returned or spare power supply to confirm it is functional before use.