Testing operating solenoid valves in pneumatic and hydraulic control equipment
Testing relays with coils and electrically controlled solenoid valves in all types of vehicles and machineries
Testing solenoid valves when servicing oil burners, the test lamp lights immediately and without metallic contact where there is a magnetic field, e.g. an activated coil in a solenoid valve.
The test lamp responds to all kind of magnetic fields - from alternating current to direct current and to permanent magnets.