1) Center guide rod using imported materials, high precision, wear-resistant;
2) Use of super-hard aluminum shell to avoid on-site work injury apparatus, to extend the service life;
3) Pointer slider with external spring ring structure, both convenient for the friction adjustment,and ensures that the pointer shaft and pointer slider friction uniform, to ensure the accuracy of the instrument-products is relatively high accuracy, quality and cheap, long service life.
5)HT-225 concrete rebound tester is suitable for testing the strength of general building components, bridges and various kinds of lining components (slabs, beams, columns, bridge frames).