The surface magnetism of a magnet is not equal to its magnetism (magnetic force).
The surface magnetism of different parts of a magnet is different.
The surface magnetism of the magnetic pole position of the magnet is the highest value, the edge is the highest, and the center is weak.
Next is our topic today, how to use a gaussmeter to measure the surface

Take a relatively conventional round powerful magnet (axially magnetized by default) as an example. It is generally recommended that the test point is the center point of the end surface or bottom surface of the magnet.
1. Determine the test point of the magnet's surface magnetism.
2. Choose appropriate Gauss measuring instruments and probes. The tool for measuring the surface magnetism of magnets is usually a Hall effect Gauss meter (or Tesla meter).
3. When testing, the probe should be parallel to the test surface, and the front end of the probe should be placed as close to the center point of the magnet as possible. The accurate test method is to place the probe close to the surface of the magnet, perpendicular to the magnetic field lines, and maintain 90°.
4. Move the gaussmeter probe up, down, left and right by 0.5 mm appropriately, and observe the value displayed by the gaussmeter.
5. When reading, try to read the value with the largest value, also called the highest surface magnetism.
6. Repeat the measurement 3 or 5 times and take the average value.
What needs to be noted here is that different magnet manufacturers have different Hall sensing elements on the Gaussmeter. Some are different in thickness, and some are different in size, so the measured surface magnetism must be different. For example, if the same magnet is measured with a domestic gaussmeter, the surface magnetism is 2000GS, but if measured with a Japanese gaussmeter, the surface magnetism is 2200GS.