The developer, Smart Tool Factory (Google Play link), also has an angle meter, a ruler app, a laser level, and other apps in case you need something else. Hover. Price: Free.

Why not use a multitool ruler that can do more than most? The ten-function Tiruler packs a protractor, caliper, bubble level and even a wrench.

LS101 Portable Vertical Laser Level: 14 Apr 2009. LS101 Portable Vertical Laser Level can provide red vertical (plumb) laser line with high precision and has the function of self-leveling. ... It can ...