Analog Sclerometer BLET special Concrete/Brick
ref : SCES3-A70M

BLET sclerometers allows to measure the hardness of several materials without destroying the matierial. It is very simple, a certain elastic force called the impact force is apply on the surface of the material and the energy non absorbed by the material is transmitted to the impact hammer which allows to measure the strength. 

This particular sclerometer is used to test small and impact-sensitive parts of concrete or atificial brick.  

To know more abour this product, you can find an online documation here.