We here at Low Oxygen Brewing run Extech DO600 pocket testers. We find them to work pretty well for the price point. I would rely on them for all hot side process as well as oxygenation. I am fairly confident in them for some cold side readings, but once things get in the parts per billion range, they just don’t have the resolution to cut it. We get asked quite frequently what we use, so we thought we would make a post about them.
They are a little finicky but overall I would say they are as easy to use as a pH meter. They do require a calibration before every use, but its no big deal.
Here I lay out the process for you!