Hand Tools

Magnetic Pole Pen, Magnetic Tester, ± 5mT (50Gs) High Sensitivity Magnet Polarity Tester, North South Poles Testers Pen 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... Magnetic Pole Pen, Magnetic Tester, ± 5mT (50Gs) High Sensitivity Magnet Polarity Tester, North South Poles Testers Pen