As much as I wished this thorn finder worked well and was willing to pay a higher price if it worked the product did not work as described. It gave erroneous and unreliable readings, rendering it virtually useless. I've tried it on about a dozen different interior walls. All walls were constructed with wood studs covered with 1/2 inch drywall, vintage 1985. All walls were latex painted except for one wall which was covered with old vinyl wallpaper. To be on the safe side, I read the instructions several times. I used it correctly. I also tried different battery packs. In the end I decided to return the item and keep using the old cheap spike finder I had for years. Maybe the device I received was faulty, but I didn't take the time to try another one.
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