I really like this tool. The display is big enough to easily read and it was calibrated when I received it. Thinking about buying a couple more.

I was looking for something that would read super low micron that was under $100 and this is perfect! I just received and my room without my flowhood is Dirty As Fu*k. I will report back after I run it for a few hours. Great little device

Came with easy to follow instructions and a link to a video tutorial, very straightforward and easy assembly. Arrived very quickly too!