Usage Tips: Essential Tool for Seasonal Checks: This circulation pump rotation direction tester is indispensable at the start of the heating season. It allows you to check the correct functioning of circulation pumps and identify any blockages after long periods of inactivity. Versatile Functionality: In addition to testing circulation pumps, this device can also check the function of oil burner solenoid valves, making it a multifunctional tool for various heating applications. Clear Indicator System: The integrated indicator effectively displays the magnetic field and rotation direction of most circulation pumps, providing immediate information on pump performance for quick diagnosis. User-Friendly Design: Designed for ease of use, the red and white screw rotates in sync with the pump, allowing you to visually and easily confirm the pump's rotation direction. Compact and Portable: Small enough to fit on a keychain, this tester is an essential tool for any plumber or heating engineer, enabling quick checks of pump function and rotation direction. Product Name: Circulation Pump Rotation Direction Tester and AC Current Detector. Batches may have different markings. Color: As shown. Material: Plastic. Package Contents: 1 x Circulation Pump Rotation Direction Tester and AC Current Detector. Note: Due to differences in lighting and screen settings, the item's color may differ slightly from the pictures. Please allow slight dimensional differences due to manual measurement.