Features: * Essential tool for seasonal inspections: This circulation pump rotation tester is extremely useful at the of the heating season, allowing the user to verify the operation of the circulation pump and identify possible blockages after a long period of inactivity. * 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. * Clear indication system: The built-in indicator effectively displays the magnetic field and rotation direction of most circulation pumps, providing an for instant image of the pump's performance for quick diagnosis. * Humanized design: The convenient design, with red and white screws rotating in with the pump, allows the user to easily and visually confirm the direction of the pump's rotation. Simple four-step operation--only applicable to the set with valve opener 1. First turn off the power and remove the motor coil 2. Put the tool on the valve stem and make a "click" sound. 3. Without making a "click" sound, turn the magnet in the opposite direction 4. After completing the manual operation, remove the solenoid valve magnet, turn the electric coil, repeat the above actions Color: As Shown Material: plastic Package Contents: 1*Solenoid valve opener 1*AC coil fast detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.