The Klein Tools RT390 is a Circuit Analyzer that tests the wiring conditions at an electrical outlet, displays AC line voltage, inspects AFCI and GFCI devices with time to trip device, and performs voltage drop tests at 12A, 15A and 20A current loads. Results are easy to understand with large, color LCD. The tester is designed for use with North American 120V AC 3-wire electrical outlets.

• Circuit Analyzer with large color LCD displays easy to understand results for wiring faults, AFCI, GFCI, voltage drops and time to trip devices.
• Detect and identify common wiring faults in standard, AFCI and GFCI electrical outlets.
• Detects dual (open neutral/open ground) wiring faults.
• Inspect AFCI and GFCI devices; includes trip time and trip current.
• 12A, 15A, and 20A load testing to measure percentage voltage drops.
• Powers off automatically after 5 minutes of inactivity to conserve battery life.
• Detachable cord for easy storage.
• For use with North American 120V AC 3-wire electrical outlets.
• Safety Rating: CAT III 135V.