Inspection plate, the test platform for a variety of inspection and precision measurement reference plane; for machine tools test to measure the baseline; check the dimensional accuracy of parts or shape deviation, and tightly crossed, is also indispensable in the machinery manufacturing The basic measuring tools. 
 Inspection plate, the accuracy of the test platform for the implementation of the National Institute of Standards Metrology and Verification, respectively, 0, 1, 2, 3, four levels; material they use a high strength gray iron HT200-300, face hardness: HB170-240 specifications: 100 × 100-3000 × 6000 (special specifications according to the demand side, drawing production) 
 Inspection plate, the surface quality of test platform can be used for coloring hair test, 0 and 1 flat on each side of 25mm / square within less than 25 points, two less than 20 points, three less than 12:00.