I have foobot if you want an IOT device. Seems to work. I have a brand new house and the formaldehyde/VOC levels were very high. It's sad that it's not regulated in the USA for residential (it is for office...). Opened the windows as much as possible. Now levels are low and I'm not as concerned.
I also got a cheaper monitor (https://www.amazon.com/gp/aw/d/B01N0MJJRO/ref=pd_aw_sim_sbs_... this has no reviews, but on mobile and don't feel like searching more) and this works as well for fast instantaneous readings. One day my wife was using moisturizer and it went crazy. Found out many bath and cosmetic products use formaldehyde (DMDM hydrogenate or whatever...different name but essentially formaldehyde)
I also got a cheaper monitor (https://www.amazon.com/gp/aw/d/B01N0MJJRO/ref=pd_aw_sim_sbs_... this has no reviews, but on mobile and don't feel like searching more) and this works as well for fast instantaneous readings. One day my wife was using moisturizer and it went crazy. Found out many bath and cosmetic products use formaldehyde (DMDM hydrogenate or whatever...different name but essentially formaldehyde)