From Media Baron:
Rulers is a PalmOS application that puts rulers in inches, centimeters or picas on your PDA screen to measure small objects. Because of the difference of screen sizes there are different application versions. Load any version, measure the calibration bar on your PDA screen in centimeters then reload the proper PRC application. Send me a postcard if you find it useful along with your PDA make, model and screen size for my database records.