• Self-test magnet
• Built-in LED flashlight
• Low battery indicator
• Magnetic Field Detector determines if components (relays, solenoids, contactors, electromagnets, permanent magnets) are working properly
• Test solenoid valves in pneumatic and hydraulic control equipment

The Triplett Model ET30 Magnetic Field Detector quickly determines the presence of a magnetic field including AC, DC and Permanent Magnets. It can test solenoid valves in pneumatic/hydraulic control equipment, relays with coils, electrically controlled solenoid valves in vehicles/machinery/oil burners, and audio speaker coils. It features a built-in self test magnet, LED flashlight and a low battery indicator. Includes (2) AAA batteries. 1-year warranty.