Cressi Mini SPG - High Quality Scuba Diving Submersible Pressure Gauge - Italian Made - Perfect for Underwater Exploration & Dive Safety

I bought this as a back up for some underwater work in a 16ft tank while my computer was being serviced. Since I was in a body of water of a known depth, I wasn't too concerned about being without my computer, but I did need a way to monitor how much air was in my tank. I didn't want to spend a lot of money on a backup gauge, but I wanted something reliable that I could trust. So I was glad to see a good name brand offered at a reasonable price that would do exactly what I was hoping for. This worked out well for me. Standard size fitting attached right to my high pressure port on regulator. O-ring made solid seal. Hose was included and worked fine. No leaks. Gauge worked reliably and seemed accurate. When my computer is back in service, I will either keep this on my rig as redundant way to check air, or I will just keep in my "save a dive" kit as a back up. Please be aware that all this does is show you air pressure in your tank, it is not a substitute for a computer and it is not a complete instrument panel: it does not have a compass or a depth gauge, or a timer. But if you have need of simply checking the pressure in your scuba tank, like I did, this will work well and is a good value.