How to test magnetic force of pot magnets?

Pot Magnet is used for mounting, lifting, holding, fixing and transferring objects which is popular in the field of construction, engineering, automotive or in the place of office, family, warehouse etc. Below pull strength enquipment is special for the test of pot magnet. How to make the test?Firstly,the pot magnet is hung on the hook and touches to the surface of the big metal(metal size:D150*35). Secondly, the pot magnet is pulled away slowly  at a speed of 3.7mm/s from the metal driven by the motor and computer system.Thirdly,computer will record the result after the pot magnet is totally away from the metal.  

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