Citrex H5 It's good for quick testing, it looks like a "digital flow meter",But it is not a professional airflow analyzer, and if you want to use it for in-depth analysis, it will be more difficult.
PF-300 is derived from Respical T300, in other words, it is an upgrade of Respical T300
As a professional air flow analyzer, I think high flow, low flow, capacity calculation... these are necessary functions
Currently I own Respical T300, Timeter-RT200
I have used Bio-Tek VT Plus HF and Fluke VT650
