re: Stud Finders ?

I have an old Zircon Stud Sensor Pro and I love it. It has a battery in it that has been in there at least 10 years and I just tried it and it works perfect. I bought a Zircon one at a garage sale in Arizona ( don't know the model) but it did not work worth a hoot! I find that they are not all reliable like the one I have...cheers, Jim