Surveying instrument of high precision, can measure both vertical and horizontal angles, unlike a level telescope which is limited to the flat angles. The name is believed to come from the Greek- meaning, The Eye of God.
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A theodolite is used to measure angles of a plane. This can be both vertical or horizontal, and it is used with high precision.
surveyors
Transit and non-transit theodolite.
Theodolite on land, sextant at sea
A protractor is used to measure angles.When surveying a theodolite is used.There are a number of tools on the market that perform angle measurement.