The Extech PRT200 phase rotation tester is a non-contact phase sequence tester which checks phase sequence and phase status. It works with up to 1000V AC with LED and audible indication. The LEDs indicate phase orientation (clockwise or counter-clockwise) and whether each phase is live. Its beeper sounds intermittently when correct phases are detected and continuously if the phase squence is reversed. The meter has a durable housing with back cover magnet for attachment to an AC distribution panel for easy, hands free measurement. Complete with three built-in 762mm (30in) test leads with large color-coded alligator clips, four AA batteries, and a pouch case . * 75 to 1000V AC input voltage with 45 to 65Hz frequency range * Hi/Lo LED brightness for measurements in difficult lighting * Fully insulated alligator clips with wide jaws * Low battery warning * CAT IV 600V safety rating * Dimensions 118 x 69 x 38mm (4.7 x 2.7 x 1.5in) * Weighs 370g (13oz)