[keenxxx]

My bother has owned @ least a dozen stud finders. Along the way he purchased quite a few units less than $50 and a couple around $200 - Milwaukee and Bosch. Be it lack of experience or in his terms bad luck he usually turns a picture hanging job into a swiss cheesed section of wall. I gave him the $10 CH Hanson magnet and he said it does ok. That means it probably works more often than not. I use the Hanson as well but also own a Franklin 710.