American Lifetime Air Quality Meter - Particle and Dust Detecting Counter with LCD Screen and 100±10%@0.5μm Counting - Battery Included + 1 Year Warranty

I got this skeptical that it can live up to its promise, I bought a few in the past for a few hundred dollars that I was not able to figure out how to use, boy did it impress me, first of all it came in this really nice case, and with instructions and it was great at detecting 0.3um, 2.5um and 10um all at the same time, no need to remeasure!It also stores the data for you and has a clear colored screen, my husband and I are really happy with it.We reached out to the manufacturer about how to use it as I am not great with technology, they replied and helped us out!