AEMC 6609 [2121.11] Battery-Powered Phase & Motor Rotation Meter, 40 to 600VAC Operating Voltage. The AEMC 6609 Battery-Powered Phase & Motor Rotation Meter is a compact and rugged meter designed to identify phase rotation on 3-Phase systems and identify live and open/de-energized phases. Ideal for installing rotating machinery or motors, and for checking generator output. The Model 6609 is also an ideal tool for measuring the proper rotation of motors, conveyors, pumps and other electrical devices interconnected on the power line system before installation where direction of rotation is dependent on proper phase hook-up.