In the US, in our litigation-rich society, I have yet to see a shop that provides Nitrox that doesn't provide an analyzer, and most of them have a log you have to sign with your name, the date, and the results of the analysis.
This is NOT necessarily true when you travel. The fill station where we used to get our tanks in MX did not have an analyzer, so we brought our own.
It is handy to own one from time to time . . . for example, if you get to a dive site and discover you've grabbed the wrong tank (or forgotten yours) and you need to borrow one from somebody else. Also, on boats, having 20 people simultaneously trying to use the one analyzer the boat has can be a drag.
We have the Oxycheq low-end model (the El Cheapo, only they put it together) and it has worked just fine for us for five years (yes, you have to replace the cells periodically). It cost us about $200.
This is NOT necessarily true when you travel. The fill station where we used to get our tanks in MX did not have an analyzer, so we brought our own.
It is handy to own one from time to time . . . for example, if you get to a dive site and discover you've grabbed the wrong tank (or forgotten yours) and you need to borrow one from somebody else. Also, on boats, having 20 people simultaneously trying to use the one analyzer the boat has can be a drag.
We have the Oxycheq low-end model (the El Cheapo, only they put it together) and it has worked just fine for us for five years (yes, you have to replace the cells periodically). It cost us about $200.