Vernier caliper masters are used to calibrate and set Vernier calipers
The master is superior to gage block calibration because they do require block stacks and thus it is much faster to inspect the linear range of the tool. Additionally they indicate wear on the caliper anvils because both the ID and OD jaws are inspected without additional setup. Vernier caliper masters are used for checking outside jaws, inside jaws, and parallelism of jaws. The lapped gaging faces are accurate with .0002" OR .005 MM from the nominal size. Vernier caliper is black-oxided to prevent rust.
Vernier Calipers like all other types of precision measuring equipment require calibration on a regular, established inspection cycle. This can be accomplished using gage blocks or gage pins. The Vernier Caliper Master provides multiple checks of the caliper which is necessary due to the typical rack & gear design or glass scale design. The Vernier Caliper Master provides 1 6 inch checks on the outside caliper along with inch to 4- inch on the inside caliper. These multiple checks verify the caliper's accuracy throughout its range of use.

• Checks outside jaws, inside jaws and parallelism of jaws
• Lapped gaging faces are accurate within .0002" or + .005mm from the normal size
• 1" to 6" range in 1" increments for outside jaw calibration
• Black-oxide to prevent rust
• NIST Certificate of Accuracy