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The Ideal 3 Phase, 100 to 600 VAC, 10 to 400 Hz, 5 to 131°ree;F LED Display Phase Rotation Tester is an essential tool for anyone working with three-phase electrical systems. This compact and easy-to-use tester accurately measures voltage, frequency, and phase rotation of AC power sources in a wide range of applications. With its sleek design and intuitive controls, the Ideal Phase Rotation Tester is perfect for industrial maintenance technicians, electricians, and HVAC professionals who need to quickly identify problems with three-phase electrical systems. Whether you're installing new equipment or troubleshooting existing systems, this powerful tester delivers the accuracy and reliability you need to get the job done right.