Hello. We’re sorry to hear of your experience with the HD800 StudSensor. There are tried and true techniques we could have helped you with that promote consistent scanning results. Quite often these issues have to do with the environment you’re operating on and knowing why the tool is reacting to density changes that may not be the studs (or objects) you’re looking for or problems with false readings. Regardless of the issue, we would have liked to have helped you to resolve the problem. We offer toll free support by phone or our interactive online knowledge base both of which can be found at the Zircon website. Thank you.