That was my whole issue, my rooted cuttings in Coco coir , Perlite and my potting mix. When I used it in my container trees in the garage, the meter works decent.
So the lesson learned and people should know is that if you are starting rooted clippings of in anything but dense soil, extreme caution should be made as the moisture meter may not accurately display the factual reading.
And here is a another tip: Clean the tip with scotch brite pad, it works real well!