Can't give 5 stars until it's been used more, but so far I like it. I deal with the home climate. My 25 year old TIF bit the bullet recently - I definitely like this one more: 1) visual indication and more discreet audio (TIF sounded like a Geiger counter and could warn customers, 2) I like the principle of sample pumping compared to a passive one Detector - responds better to leak testing, 3) probe tip is well designed for spot checking, 4) easy to use, 5) good probe length.