I am a certified mold inspector/remediator,I just compledted a job using the BI2200 Basic meter by wagner,It was only to test for moisture in a condo complex and I made $4200 in one day. Easy to use, good results and I am very pleased with its performance. I was in a meeting with the state director of environmental heath yesterday and showed off my meter and today his assistant e-mailed me for info on how they could buy one .