You have to take into account exactly the dimensions of your alnico. think of it as a water tank. Small tanks hold less than big tanks. Also, hold down the button on the Carlsen Melton and move the probe all over the pole face including the edges and corners as this will show the maximum gauss.
The gauss will drop off too after charging and settle to a relative constant.
BTW, I'm glad to see you took the advice on choice of gaussmeter. It really is a fine piece of kit.
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