Dacor - old Pressure gauge battery replacment

[wwtucson]

I just purchased a older Dacor pressure gauge that has a digital window. I think it's a down timer. How do you replace / check the battery? My local dive store ( Sports Chalet ) said they don't replace the battery in Dacor's.

 

[gap]

Is it a depth game or a pressure gauge? I have a Dacor Digital depth gauge and there is a battery compartment on the back. Unscrew with a quarter and replace batteries with CR2032 x2.
Really simple.