The micrometer is a high-precision instrument used for measuring linear quantities using the absolute method. A vernier caliper is a high-precision tool used for measuring external and internal linear dimensions, the depth of holes and grooves. The application contains information about how to use a micrometer and how to use a caliper, to make measurements, to count correctly the readings of measurements, what types of devices there are and their accuracy. We hope our app will be useful to You.