Review on Nuvair O2 Quickstick Oxygen Analyzer by Darryl Jennings

I bought this to do O2 analysis in enriched air tanks (nitrox) for scuba diving. A small difference of 1.2% between what is on the label and what is actually in the mix can change the dive plan. After calibrating at 20.9% with a conventional air bottle on the valve port, I tested the bottle at 30%. Quickstick registered 36%. We tested with two other testers who registered 30%. Surprised, we put the 1st stage and the regulator on the EANx tank. Then I checked the controller with a quickstick. 30% registered. Just my experience, but I've had to do it over and over again. Quickstick is not suitable for testing the actual valve. Otherwise it is easy to use. Update :: Rating changed October 2017. After three dives the whole stick wobbled. Does not stand up to calibration, results are very different from other gauges. Couldn't trust the results. Wouldn't recommend it.