I bought a house and the ductwork had numerous leaks. Before I began to seal the leaks I bought this meter to measure existing airflows. I also re-measured a few times as the work progressed and measured the final results. Although I could feel an obvious improvement in air circulation and distribution of heating and cooling, it was nice to have some data to work with.While the meter certainly worked well for that project, now that the work is complete I will only have occasional use for this tool. If you are in a similar situation you will have to decide if spending the money is worth it. If I could have rented or borrowed a similar tool I would have done so.Pros: It works as described. Nice hard shell case included.Cons: The cord is short and pulls out of its socket easily. A cord with a locking plug would be a better design. The thermometer function is handy but it responds slowly.Notes: Someone posted a question regarding certification of calibration. It has none but the instruction booklet says it conforms to some standards, which I posted as a reply. See the questions section if you need this information.