Indian pattern clinometer (Tangent Clinometer) is used for determining the differences in elevation between points and is specially adapted to plane tabling.

The clinometer is placed on the plane table which is levelled by estimation.

The clinometer consists of the following:

(1) A base plate carrying a small bubble tube and a levelling screw. Thus, the clinometer can be accurately levelled.

(2) The eye vane carrying a peephole. The eye vane is hinged at its lower end to the base plate.