Customizes the length, mass, and angular measuring units for your system. For information about setting the units of measurement, see Setting the units.

Enables/disables automatic saving of files, see Save settings.

Specifies the decimal place used for the measure distance and measure angle output results.

Switches the built-in calculator between an RPN and a standard calculator, see Using the calculator. Diameter and Radius sets the calculator to measure in radii or diameters, respectively.