Giri -The RPM Checker- is a specialized RPM measurement tool designed for iPhone users. It is particularly useful for measuring the rotational speed of motors, such as those found in drivable model cars. The application offers features focused on noise removal, a speed conversion panel, a memo panel, and the option to customize the interface with various skins.

To ensure accurate measurements, users are advised to conduct RPM checks in a quiet environment with only the motor sound present, for example, by removing the gear. Additionally, the app recommends placing the iPhone close to the motor's microphone for optimal results.