For those with monitors. I'm attempting to improve the air quality in the shop, it's in the basement. I have a 1 stage dust collector with Merv 15 filter canisters and am looking into a ceiling mount air filter. I'm figuring that since I'm going in this deep I should get a monitor to see when and for how long I need to run the filter. So being cheap, does one need a monitor that goes down to .5 microns? I see the $200 Dylos has 2 ranges, 1 & 5 microns, the Pro $270 model has .5 & 2.5 ranges. I also see other manufacturers with even lower cost $100 models that have 2.5 & 10 micron ranges.