[DETECTS AC MAGNETIC FIELDS] Designed to react to strong AC magnetic fields, the internal disc visibly rotates when exposed to active coils or solenoids, giving you a fast, intuitive indication of electromagnetic activity so you can troubleshoot valves, pumps, and other powered components with confidence. [PUMP ROTATION TESTING MADE EASY] Quickly verify the rotation direction of circulating and booster pumps with this dedicated solenoid valve tester, helping you confirm proper installation, avoid performance loss, and reduce wear or damage during plumbing commissioning and routine maintenance. [MULTI-PURPOSE ELECTROMAGNETIC TOOL] Combining AC electric field detection with pump rotation testing, this versatile diagnostic tool supports a wide range of maintenance, repair, and inspection tasks, helping plumbers, HVAC technicians, and facility managers locate faults and verify correct operation on site. [CONVENIENT AND USER-FRIENDLY DESIGN] Tailored for professional plumbers and service technicians, this compact tester easily into a pocket or tool bag, allowing quick, on-the-spot diagnosis without complex setup, batteries, or calibration, so you save time on every job and respond faster to issues., Weight: 0.01212542441 Pounds, Manufacturer: Aboiled