Size

 Squareness between two measuring surfaces(Grade:00)

 Straightness of measuring surface

 Parallelism between opposite measuring surface

 160*160

 2

 03.8

 2

 200*200

 2

 0.9

 2

 2580*250

 22

 1

 2.2

 315*315

 2.6

 1.1

 2.2

 400*400

 3

 1.3

 3

 500*500

 35

 1.5

 3.5