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Internal master gears are particular types of internal gears that are used to calibrate and measure other internal gears. They have many advantages, such as:

• They ensure high accuracy and precision of internal gear measurements, as they have a known and certified pitch deviation and profile error.

• They reduce the wear and tear of the measuring instruments, as they have a smooth and polished surface finish and a hardened tooth profile.

• They increase the efficiency and reliability of internal gear systems, as they help to detect and correct any errors or defects in the internal gears before they are installed or used.