MASTFUYI Magnetic Pole Tester - Accurate N/S Polarity Identification Pen for Magnet Sensitivity Detection & Field Determination

Description:

MASTFUYI FY8851 Magnetic Pole Pen Polarity Tester N/S Pole Detector North South Magnetic Pole Identifier Magnet Detector More

Description:

It is easy to see, LED light emitting diodes will show their polarity in different colors, red is N pole, green is S pole. It adopts a portable pen holder design, which is small and light, easy to carry, and can be measured anytime and anywhere... More