What component is NOT part of a total station?

A total station is a modern surveying instrument that combines the functions of a theodolite, electronic distance measurement (EDM), and often includes a central processor and an electronic data collector. Each of these components plays a vital role in the total station's operation, allowing for the measurement of angles, distances, and the collection of data that can be used for various surveying tasks.

The central processor is responsible for processing the measurements and calculations, the EDM instrument is crucial for determining distances accurately using electromagnetic waves, and the electronic data collector is used to store and manage the survey data. Thus, these three components form the core functionality of a total station.

While a horizontal leveling device is important for leveling and establishing a reference plane, it is not an integral component within a total station itself. Instead, leveling might involve using a separate spirit level or other instruments for setting the total station in place. This distinction underscores that the horizontal leveling function is not built into the total station apparatus but may be conducted externally or with independent tools.