Shearwater Perdix II AI & Leonardo SPG PSI difference

[dj90423]

Recently did five, two-a-day dives in Cozumel. I noticed that there was a difference in my tank pressure of at least 100 PSI between my dive computer/AI and my Leonardo SPG. Does my Perdix II need to be calibrated or is there a logical explanation?

 

[tridacna]

Recently did five, two-a-day dives in Cozumel. I noticed that there was a difference in my tank pressure of at least 100 PSI between my dive computer/AI and my Leonardo SPG. Does my Perdix II need to be calibrated or is there a logical explanation?

Go to a diveshop where they have a tank of known pressure. Connect your devices and compare readings.

FYI: It’s a Cressi SPG. Leonardo is the computer.

 

[inquis]

Odds are the SPG is off.