Stud finder locates biscuits in woodworking projects

After marking and installing biscuit joints in several boards that I've glued up edge-to-edge, I then plane the glue-up to thickness and rip it to finished width. The problem is that, in the process, I also remove the marks that show the biscuit locations. Later, when crosscutting the glue-up to length, I sometimes cut through one of the biscuits - and that leaves me with a very unattractive edge. One day, while gluing up some long pieces of oak, I grabbed my electronic stud finder and ran it along the seam. To my surprise, it located every biscuit in the boards.
– Dick Diedrich, North Lake, Wis.