Features: * Essential tool for seasonal inspections: This circulation pump rotation tester is extremely useful at the start 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.