Qualité des dalles de granit : garantir l'exactitude des mesures de précision
The precision grade of granite flat plates is the core guarantee for the accuracy of precise measurements. The grade classification is centered on flatness tolerance, following the national standards GB/T 20428-2006 and JJG 117-2013. The mainstream grades are 000, 00, 0, and 1. Grade 000 is used for higher precision scenarios, 00/0 grades for general…