A mechanical SPG that reads high may indicate a malfunction. Is this statement true or false?

The statement that a mechanical submersible pressure gauge (SPG) that reads high may indicate a malfunction is indeed true. A mechanical SPG measures the pressure of the gas in your scuba tank, and if it consistently shows unusually high readings, this may suggest a problem with the gauge itself or an incorrect calibration, rather than an accurate reflection of the tank pressure.

A properly functioning SPG should provide readings that closely match the actual pressure in the tank. If it reads higher than expected, especially in comparison to other gauges or during a refill, it could signal issues such as a stuck needle, internal damage, or incorrect installation.

For divers, understanding this aspect is critical for ensuring safety underwater. Relying on faulty equipment can lead to dangerous situations, including running out of air or not being aware of the true state of one's air supply. Thus, it’s essential for divers to be diligent about monitoring their instruments and recognizing potential signs of malfunction.

As for options implying various levels of certainty or specificity like “depends on the model” or “not enough information,” these do not accurately capture the general principle that faulty readings on an SPG, including readings that are too high, indicate a malfunction.