Principles of Measurement
When a vibration rod of a certain material is pushed onto the surface of a test sample with a certain force, the softer the material of the sample, the deeper the indentation and the stronger the binding force.
In addition, the higher will be the resonance frequency.
In contrast, the harder the sample material, the weaker the binding force and the lower the resonance frequency.
The checker calculate the hardness of materials from the relationship between resonance frequency and hardness.

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