1.Essential tool for seasonal inspections: This circulation pump rotation tester is very useful at the beginning of the heating season, allowing users to verify the operation of the circulation pump and identify possible blockages after a long period of inactivity. 2.Versatile: In addition to testing the circulation pump, the device can also check the operation of the oil burner solenoid valve, making it a versatile tool for a variety of heating applications. 3.Clear indication system: The built-in indicator can effectively display the magnetic field and rotation direction of most circulation pumps, instantly displaying the pump's performance for quick diagnosis. 4.Humanized design: The convenient design, the red and white screws rotate synchronously with the pump, allowing users to easily and intuitively confirm the rotation direction of the pump. 5.Compact and portable: This tester is small and portable and can be hung on a keychain. It is a must-have tool for every plumber or heating contractor to quickly check the operation and rotation direction of the pump. Part Name: Circulation Pump Rotation Tester Simple four-step operation - only for sets with valve openers 1. Turn off the power first and remove the motor coil 2. Put the tool on the valve stem and make a "click" sound. 3. Without a "click" sound, rotate the magnet in the opposite direction 4. After completing the manual operation, remove the solenoid valve magnet, rotate the motor coil, repeat the above operation until the valve opens, and then put it back in place. Color: Red Material: plastic Package Contents: 1 x Circulation Pump Rotation Tester (Electronic)