Looking forward to their reply! :-) Keeps surprising me how hard it is to find something that easy. Of course I could simply use any kind of vented enclosure, but these seem less suited for outdoor use... https://www.google.com/search?q=vented+sensor+enclosure&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjR8eSizKfoAhWEsaQKHfAvBK4Q_AUoAXoECAsQAw&biw=1920&bih=937

@secantscope I understand - It is a few years since I looked into this and then the only conclusion I could make was to take a meter and interface with usb. It would be more work and my needs case didn't warrant that at the time. I am sorry I could not be of more help in this, but it just seems to be the way things have been for a while. Maybe in the future things will change. As @nagelc suggested a lesser sensor could be used and you could calibrate it yourself. Seems little other options really. (Now I said that you just wait for a killer posting with just the thing you want linked) !!! ;)

@secantscope said in Enclosure for Honeywell HPM-series PM sensor: @Nca78 said in Enclosure for Honeywell HPM-series PM sensor: For enclosure, another option is a radiation shield. What do you mean by "radiation shield"? Try Google ;)