we need more data.
is it this one?
is it this one?

The C02x movement uses three SR920W (Maxell) or 370 (Eveready) silver oxide batteries. Depending on frequency of use of the depth gauge and alarms, the batteries should last 2-3 years.narwalos said:what is the type of battery inside (there is 3 battery inside) ?
Hi, Sir Les.Sir said:The C02x movement uses three SR920W (Maxell) or 370 (Eveready) silver oxide batteries. Depending on frequency of use of the depth gauge and alarms, the batteries should last 2-3 years.
Btw, I don't think the 'black' model has a titanium case. I think it's the normal stainless steel case, sprayed with a hot mixture of alumina (Al[sub]2[/sub]O[sub]3[/sub]) and titanium oxide (TiO[sub]2[/sub]) to increase hardness and wear resistance. The process is known as 'black spraying' and has been used on the Space Shuttle, jet engines and nuclear power stations.
Sir said:The C02x movement uses three SR920W (Maxell) or 370 (Eveready) silver oxide batteries. Depending on frequency of use of the depth gauge and alarms, the batteries should last 2-3 years.
Btw, I don't think the 'black' model has a titanium case. I think it's the normal stainless steel case, sprayed with a hot mixture of alumina (Al[sub]2[/sub]O[sub]3[/sub]) and titanium oxide (TiO[sub]2[/sub]) to increase hardness and wear resistance. The process is known as 'black spraying' and has been used on the Space Shuttle, jet engines and nuclear power stations.
No, it's a completely different calibre, using 1 large coin-size lithium battery instead of 3 silver oxide cells. The C520 measures depth in metres, and the C526 measures in feet.narwalos said:thank you for your answers.....for the second generation (series) at promaster aqualand there is inside the same movment quartz ??