Submitted by a reader, Ruler is a ridiculously simple but actually useful app. All it does is display a ruler with inch and centimeter markings on the screen so you can measure stuff with just your phone.

Before you can use the app for the first time you have to calibrate it with a real ruler. To calibrate press the “Adjust” on-screen button, or the corresponding soft key, and use the on screen arrows,  or the up and down keys on non-touchscreen phones, to adjust the on screen ruler’s size to math that of the real ruler. If the Adjust button isn’t visible, tap the screen or press the OK or Enter key to make it appear. When you are done with the calibration tap the screen or press OK or Enter to hide the on screen buttons or labels and make the ruler full screen.

Type: Freeware
Author: DK Software
Data Connection Required: no
Minimum Java ME profile: MIDP 2.0
Screen Size: All
Touch support: Yes
Reported working on: LG 306g, Nokia Asha 303
Reported NOT working on: Samsung Wave GT-S8500 (runs but Adjust buttons don’t work)
Please let us know in a comment if it works or not on your phone.

The app “Ruler” (48 KB) is ready to download or send to your phone as filename: “Ruler”.

Downloading uses paid data. Downloads are for Java ME phones only.

To download and install click here: DOWNLOAD (jad)

Alternate downloads: jarzip