We're very sorry to hear of your experience with the Pro SL StudSensor. We wish we could have helped you at the time. The Pro SL is a proven good tool. Under normal conditions it should be a very easy and accurate scanner to use. There are enough variables in wall construction (insulation properties, moisture issues, general inconsistencies, etc. etc.) that we would have had to do some trouble shooting with you to figure it out. Whatever the issue is, we know from experience, there is always a reason and a solution for these problems, and we stand behind our products. We offer toll free support by phone (800 245 9265) during normal business hours Mon. thru Fri. 8:00am to 5:00pm PST. We also maintain a 24/7 interactive online knowledge base as well as email support that can be found at the Zircon website (www.zircon.com). Thank you.