What is the function of a depth gauge?

The function of a depth gauge is primarily to measure the current depth of the diver underwater. Depth gauges are essential instruments in diving, as they provide real-time data regarding how deep a diver has descended. This information is crucial for ensuring the diver remains within safe limits, avoiding issues associated with exceeding certain depths, and managing the dive plan accordingly.

Depth gauges help divers monitor their ascent and descent rates indirectly by maintaining awareness of their depth throughout the dive. They also aid in planning the ascent to avoid rapid changes in pressure that can lead to decompression sickness. This tool supports divers in adhering to safety protocols and efficiently using their dive tables or dive computers.

The other options involve functions that require additional devices, such as air consumption tracking, ascent rate calculations, and temperature measurements, which are beyond the basic scope of a depth gauge's capabilities.