Electronic magnetic pole finder MPF-120

The hand-held electronic magnetic pole finder / magnetic pole detector that instantly provides a positive reading of N or S polarity. Simple, push-button operation. Just point and read RED indicates NORTH, GREEN indicates SOUTH. Unlike mechanical devices which can be altered by external magnetic fields, this pole finder prevents false readings and cannot become magnetized The magnet pole finder (pole identifier) is guaranteed 100% accurate. It can be used to NdFeB, SmCo, AlNiCo, hard ferrite and most other magnets and refrigerator magnets. The minimum detectable magnetic field is ±9mT (90G)