The best one I've downloaded I like that it reads out the precise measurement, good job developers!
Could be better I could not calibrate the scale. Next to a "real" ruler, the app was off by 1mm. Also could use auto off to conserve battery.
Pretty decent This app is good if you need a rough measure of something quickly.
Ruler is inaccurate Ruler is about 6 percent long; can't seem to calibrate
3fifty6 Works just the way it should.
Internal library fixed