Why Measure Depth by Depth Micrometer why not Vernier caliper?

We also measure depth through Vernier caliper, but Vernier caliper does not deliver as much as accuracy and precision, because extension rod of Vernier caliper has no standard, it used only for comparison purpose. Depth micrometer used to measure the depth of an object with precision and accuracy with least count of 0.01 mm. The … More Why Measure Depth by Depth Micrometer why not Vernier caliper?