oxygen analyzer

[divbum]

You'll get the oppertunity to see 3 or 4 different ones in the course, so unless something is pressing I would hold out until after the class.
I personaly use a ceramtec - which is very expensive but has been bullet proof for several years now and it gets a lot of use. But that being said if I was going to buy a new one tomorrow I would buy an Oxycheq - affordable, relieble, fast read out, and it is quality.
Pro's of owning any unit - you have it to double check your gas before you dive. This is especially nice if you own several tanks that are sitting around your garage waiting to get used.
Con of not owning - inability to do the above.