AEMC 6608 [2121.10] Line-Powered Phase Rotation Meter, 40 to 850VAC Operating Voltage. The AEMC 6608 Line-Powered Phase 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.