1) Inclinometer 2) Surveying instrument 
instrument used to measure slopes and elevations
• (n.) An instrument for determining the dip of beds or strata, pr the slope of an embankment or cutting; a kind of plumb level.
A hand-held instrument used for measuring percent of trail grade. The user sights through the Clinometer to a reference (usually a second person) and reads the measurement directly from the internal scale.
Small instrument for measuring gradients (calibrated spirit level).
Cli·nom'e·ter noun [ Greek 
A clinometer is an instrument used for taking the dip and strike of rock strata.
[n] - an instrument used by surveyors in order to measure an angle of inclination or elevation
An instrument for indicating the lateral attitude of an aeroplane.
noun an instrument used by surveyors in order to measure an angle of inclination or elevation
an instrument used to determine the height of a tree.
an instrument for determining angles of inclination or slope.
An instrument that is held at eye level to read stump height and merchantable or total height when standing 50 and 66 feet from the base of the tree. The difference between the two readings yields the height.