Not sure about the solo version, the the divesoft analyzer I have shows nothing if there is nothing or if the flow is too fast. The old proflow limiter was great. I'm really going to hoard mine now. I got to use the newer updated one and it sucks. It was great in you had a consistent flow from one check to the next. Now it sucks as much as the cheap ones. O2 reading a little lower than you want, just crack open the flow a little more and bump that number a touch. And Helium, the only way I could get a reading with the new proflow was to blow it through and shut off the flow. Then what was in the analyzer would give me a number. It's pretty close to what I was supposed to get, OK, that's the number I'm using.