AC Indicator
[Pumpsnurra]

AC Indicator / Rotation indicator

The indicators consist of a red/white disc, mounted on an axle in a housing. On top of the housing, just above the disc, there is a transparent plastic lens that makes the disc appear clearly.

When the indicator is exposed for an AC magnetic field that is strong enough, the disc can not remain motionless, and it starts to rotate in either direction. The rotation of the disc indicates an AC magnetic field in the point where the indicator is placed or held.

Apart from just indicating an AC magnetic field, the VJK indicators also can be used as rotation testers for certain circulation pumps.