-- Good isolated probe adapters are very expensive, and cheap ones have lots of artifacts that corrupt your readings. IMHO they are only for special circumstances. You have to work with them to learn what the artifacts are and how to compensate for them. My only probe is now a electrical/magnetically decoupled probe as my lovely 3 year daughter chopped the lead into many pieces. Justin -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics