75 to 1000VAC input voltage with a 45 to 65Hz frequency range;LEDs indicate phase orientation (clockwise or counter-clockwise) and whether each phase is live;Beeper sounds intermittently when correct phase is detected and continuously if phase is reversed;Durable housing with back cover magnet for attachment to an AC distribution panel for easy measurement;Adjustable Hi/Lo LED brightness switch for making measurements in dimly lit areas or sunlight

• Extech PRT200 Phase Rotation Tester

Extech PRT200 Phase Rotation TesterFLIR SYSTEMS, INC.