Pole detectors are used only to check the polarity of the magnet.
It is used where magnet strength is not required to be measured.
FI make pole detectors are rugged and handheld to make them useful in the field.
The tip of the unit detects the field polarity.
The magnet surface is placed parallel to the unit tip.
Two 1.5V AA battery operated. Power ON Switch activates the sensors and gives visual indication
in form of two LEDs placed on the arm of the unit.
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