Versatile: In addition to testing the circulation pump, the device can also check the operation of the oi. Essential tool for seasonal inspections: This circulation pump rotation tester is very useful at the beg. Clear indication system: The built-in indicator can effectively display the magnetic field and rotation. Compact and portable: This tester is small and portable and can be hung on a keychain., Weight: 0.02094391489 pounds, Manufacturer: Prterver