Overview

This magnet polarity tester DIY kit is a practical electronic assembly module designed for hobbyists, electronic education, laboratory testing and magnet processing workshops across Europe. After soldering assembly, the tester can quickly identify the North Pole (N) and South Pole (S) of permanent magnets by red and blue LED indicators.

Powered by a standard CR2032 button battery, the unit features compact teardrop-shaped PCB design with a built-in battery holder and power switch. No external power supply is required, making it highly portable for on-site inspection. It is widely used in magnet production quality checks, model building, physics teaching, electronic maker projects and daily magnetic testing tasks.   Main Features

1. ✅ Clear LED indication: Red LED for North Pole, Blue LED for South Pole
2. ✅ Compact handheld PCB design, easy to carry for field testing
3. ✅ Equipped with power ON/OFF switch to save battery power
4. ✅ Powered by common CR2032 lithium button cell (battery not included)
5. ✅ Complete DIY soldering parts set, ideal for electronics teaching & STEM education
6. ✅ Simple circuit principle, stable detection performance, easy assembly
7. ✅ Suitable for neodymium magnets, ferrite magnets and other permanent magnets

Package Contents

1 × Printed Circuit Board (PCB) 1 × Battery holder for CR2032 1 × 4-pin Hall sensor 1 × Slide switch 2 × LED indicators (Red & Blue) 2 × Carbon film resistors

Application Scenarios

• Physics STEM teaching and student electronic practice
• Magnet factory incoming inspection and finished goods testing
• RC model, FPV and maker project assembly
• Laboratory magnetic pole identification
• Hobby electronics learning and soldering training

Notes

1. CR2032 battery is NOT included in the package.
2. Please pay attention to component polarity during soldering (LED, Hall sensor).
3. The tester works for permanent magnets; it cannot test electromagnets without magnetic field.