Clinometer is an instrument that measures vertical slopes,usually the angle between ground or the observer and a tall object. The name clinometer comes from Greek and English words. "Klinein" (Greek) means to slope. "Meter" (English) means measurement.
A simple way to create a clinometer is to tape a straw to the bottom of a protractor, then tape a piece of string to the 90 degree line. Finally, you can add a small weight onto the string to allow it to stay straight. It is recommended you use something with a hole in it, like a washer or a potato