8631620 EZ-1X Ozone Monitor, Continuous Duty

Excellent, accurate and affordable. Works better than expected based upon reading the instructions. The response time is very fast, 2-3 seconds and it is very sensitive – the scale begins to read well before the ozone level is high enough to be irritating to me. The colors match the level of nuisance very well too – red is definitely get out of there but still MUCH lower than the ozone generator puts out – the sensor shoots to red in a snap if you pass it in front of the ozone generator (it does take a while to come back down when it is real saturated though). I put it in the bedroom when I use the ozone generator so that I don’t have to guess whether the level has gone down enough to go back in yet, also to verify full circulation – Nice. A great functional and educational tool for using ozone in modern housekeeping.Note: The product image is incorrect, it looks similar but is not the EZ-1X, I think the product shown has become obsolete.