Magnetic field detector 1010, peaktech

The PeakTech 1010 is a practical test device in pin design,
ideally suited for checking magnetic fields and the correct
function of coils, e.g. Relays and solenoid valves. The
magnetic field detector works without contact, so that
opening the housing is not necessary in most cases. When a
magnetic field is detected, the probe tip lights up permanently
blue, with clocked relays in the same cycle as they are
controlled. The function of the magnetic field detector can be
checked before each measurement with the enclosed test
permanent magnet.

Magnetic fields: AC / DC; permanent magnet
Detectable
inductors:
63 H, 98 H, 401 H, 810 H (H = Henry)
Power supply: 2 x 1,5V AAA batteries