4375950 is a phase sequence and motor rotation tester designed for verifying correct motor rotation and wiring phase sequence in 3-phase systems. It features a voltage range of 40-700 V for phase rotation detection, non-contact wireless motor rotation detection with a frequency range of 16-400 Hz, and a backlit LCD display for clear readings. The tester is rated CAT IV 600 V and conforms to EN 61010 and EN 61557 standards, with a durable rubber casing providing 3 ft (1 m) drop-proof protection. Operating within a temperature range of 0°C to 40°C and powered by 2 AAA batteries, this compact instrument measures 5.43 in x 2.56 in x 1.3 in and weighs 0.38 lb. It is an essential tool for commercial and industrial environments where proper phase sequencing and motor rotation verification are critical.