The PeakTech 1010 is a practical testing device in pen form, ideally suited for checking magnetic fields as well as the proper functioning of coils, such as relays and solenoid valves. The magnetic field detector operates contactlessly, so opening the housing is usually not necessary. When a magnetic field is detected, the testing tip lights up permanently in blue, and for pulsed relays, it flashes in sync with the control signal. With the included test permanent magnet, the functionality of the magnetic field detector can be checked before each measurement.