How is the precision grade of marble divided

In terms of precision level classification, marble platforms can be divided into three precision levels, namely level 0, level 00, and level 000. Ordinary specialized marble platforms belong to level 0 precision. For example, a 300 * 300 marble platform has a precision error of 1.5 microns for level 000, 3 microns for level 00, and 6 microns for level 0, which is considered a relatively high measuring tool. Although the precision of the marble platform is high, there are also requirements for its use. For example, the 000 grade marble platform needs to be produced in a constant temperature, dust-free, and vibration free workshop, and also needs to be used under these conditions because it does not meet these conditions during transportation. Therefore, the 000 grade marble platform needs to be processed in the user's constant temperature workshop.