More tools like the Ebisu Slant Level
This is an excellent tool!
The Ebisu slant level is an excellent tool. It is a rotating protractor with a spirit level held within. It allows you to establish inclines and the scale not only has degrees 360 but also has the ratios marked. A useful tool for building/repairing roofs and setting out staircases, good for drainage as well. The spirit level rotates inside the protractor by a cog wheel and thumb drive so is sturdy enough to get to tricky places and complete an accurate reading separately.