Feature: 1. A professional tester for identifying the polarity of magnetic field fastly and safely. Specification: Specifications: Material: ABS Sensitivity: ±5mT (50Gs) Display: 2 LED lights (red = N pole, green = S pole) Service Temperature: -20~80℃ Storage Temperature: -40~150℃ Power Supply: 2 * 1.5V AAA battery (NOT included) Item Size: 154 * 27 * 24mm / 6.06 * 1.06 * 0.94in Item Weight: 64g / 2.27oz Package List: 1 * Tester |