I can't comment on the use for commercial work, I'm sure there are better and more accurate tools. If you want to test your runs at home, this works great. The interface is very easy to use and provides all the necessary information. A flashlight on top is also nice when you're working in a dark place.
π Dioxide Controller for Digital Gas Monitoring
5 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
Digital multimeter RGK DM-12
6 Review