Definition
A tacheometer (also spelled tachymeter) is a surveying instrument used for rapid measurement of distances, elevations, and angles. It's like a super-efficient tool for land surveying, combining the functions of a theodolite and a distance measuring device. Think of it as a single device that can do what used to require multiple instruments and measurements. Tacheometers are particularly useful in situations where speed and accuracy are both important. Surveyors use them to create detailed maps and plans.