Polarity Tester,SIUKE Magnetic Pole Pen Polarity Tester N/S Pole Identify Tool North & South Magnetic Pole Identifier Magnet Detector
$19.99
Description
A professional tester for identifying the polarity of magnetic field fastly and safely..Pen type magnetic tester, mini and portable..One button operation, easy to use..The north and south polarity can be distinguished by the two signal lamps(red = N pole, green = S pole)..Comes with a sturdy plastic tool case.
