Granite surface plates are the standard measuring tools; they are the ideal datum for testing instrument and meter, precision instruments and mechanical parts.

There are four points we should following:
1. Granite is brittle; we should avoid bumping, beating so that any dents of the surface. It is easy clean; simple cleaning by cleanser is ok.
2. Granite surface plates which are painted should be dealt with paint stripping agent following instruction for users. Then wipe by steel wool, burnish by electric grinder.
3. Minor scratch, special cleanser for granite and conditioning agents are used; wipe by steel wool for serious scratch, then burnish by electric grinder that leaves behind a slick.
4. For the expensive one, professional maintenance staff is needed. Jianxin can supply you a professional service.