I purchased a Sun Nuclear Radon monitor model 1029, I can use it here in Wisconsin. Since having it I have had a number of error codes come up which has resulted in the company telling me to put in a special code to clear, then sending it, after the 3rd incident to the company for repair. I get it back and now I have a new error code and have to send it back once again the the manufacturer. They are sending me a loaner, a lesser model, to use until they replace my monitor. So, the question to the masses is this, is anyone else finding these types of problems with monitors. I have asked around and it seems the company does have some quality issues. Thanks for the feedback. [:-bigmout