1. The magnetic pole identification pen is a quick, easy, and safe tool. It is an instrument used to identify the polarity of a magnetic field. 2. It adopts a portable pen holder design, which is small and light, easy to carry, and can be measured anytime and anywhere without taking up space. 3. A high-precision, sensitive probe and a high-performance chip make the measurement more sensitive and accurate. 4. It is easy to see; the LED light-emitting diodes will display their polarity in different colors: red is the N pole and green is the S pole. 5. The magnetic pole identification pen is powered by two AAA1.5V batteries, and the usage time is about 10 hours or more.