Features 1、The magnetic pole identification pen is a fast, 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、High accuracy sensitive probe and high performance chip make the measurement more sensitive and accurate. 4、It is easy to see, LED light emitting diodes will show their polarity in different colors, red is N pole, green is S pole. 5、Magnetic pole identification pen is powered by two AAA1.5V batteries, the use time is about 10 hours or more. Specification Item Type: Magnetic Pole Pen Model: 862M Material: ABS Power Supply: 2 x AAA 1.5V (Battery Not Included) Purpose: to identify the polarity of the magnetic field Sensitivity: ± 5mT (50Gs) Display: 2 LED light emitting diode display (red = N pole, green = S pole) Use Time: about ten hours or more Operating Temperature: -20℃ -+80℃ Storage Temperature: -40℃ ~+150℃ Package List 1 x Magnetic Pole Pen (Battery Not Included) 1 x Tool Box 1 x Manual