App contains virtual measurement tools that the user can use both to learn how to measure and practice. The user receives feedback from the application, and knows whether reading the measured value correctly or not The application simulates: - a vernier caliper with the 1/10, 1 / 20,1 / 50 precision and shows the user how to read the measured value. - vernier caliper 1/128" - Micrometer 0-25mm , accuracy 0,01; -Dial caliper; , accuracy 0,02; - Micrometer 0,01, - external dial instrument -Dial indicator The application is educational, not used for effective measurement. It has a very similar interface to real instruments, and is very easy to use.