Micrometer Screw gauge and vernier caliper both are length measuring devices.
Difference between screw gauge and vernier caliper in tabular form
| Micrometer Screw gauge | Vernier caliper |
| It has a screw to measure so that it is called a Screw gauge. | It is invented by Perri vernier and has calipers to kept so that it is called Vernier caliper. |
| It has a circular scale. | It has a vernier scale. |
| It rotates to measure the objects. | It slides to measure the length. |
| It measures the thickness and diameter of a very small object just externally. | It measures the thickness, depth, external and internal diameter of the object. |
| Its usual least count is 0.001 cm. | Its usual least count is 0.01 cm. |
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Vernier scale mainly measure linear dimensions, In the case of depth measurement vernier caliper will be a great choice , other hand perfect tools for thickness measurement is screw gauge. This two tools are very useful.
Least count what u give thats in centimeters or in mm its not clear. I think its cm
yeah. in centimeter