Which of the following tools is NOT commonly used in land surveying?

In land surveying, professionals rely on various tools to accurately measure angles, distances, and positions of the land. Theodolites, total stations, and GPS units are essential instruments used regularly in this field.

Theodolites are precision optical instruments for measuring angles in horizontal and vertical planes, making them valuable for surveying tasks. Total stations, which combine levels and theodolites with electronic distance measurement (EDM), facilitate accurate and efficient data collection. GPS units provide precise location data by triangulating satellite signals, making them critical for modern surveying, especially in large or remote areas.

In contrast, pressure gauges are not typically employed in land surveying. They are generally associated with measuring pressure in fluids or gases and do not serve the primary purpose of measuring distances, angles, or coordinates integral to land surveying.