When purchasing cast iron flat plates, when choosing specifications and accuracy, we must first make clear the purpose:

1, instrument maintenance, calibration and maintenance of measuring instruments, you should buy smaller ones with high precision, such as 500X500, 1~2 precision.

2. If the fitter draws a line, it should be large with average accuracy, such as1200x700/1500x800, with 2~3 grades of accuracy.

3. It is best to ask the personnel in the specific use department before buying, so as to avoid "thankless".