.... After reading this thread http://familywoodworking.org/forums/showthread.php?t=1466
I felt I should share this post with everyone.
Zircon And Other Stud Finders
.... I wanted to put up some shelving on a given wall the other night. Over an hour later, I hadn't got past trying to find two of four studs in the wall. The bottom half of the wall is particleboard and the top half is sheet rock. I finally established a ROUGH line on one side of one of the studs. On the other side of the stud I could NOT establish consistent repeatable mark(s). Matter of fact, I now have a whole wall full of marks that I cannot draw a straight, vertical line down on the other side of this stud. I have two Zircon units that I was using and replaced the batteries in both (Studsensor 4 and the Triscanner). The Studsensor 4, which I think is slightly more sensitive than the Triscanner, have some differences between them. For the most part I could NOT establish a good repeatable mark(s), some would be 1/4 to 1/2” from the first original mark and some did repeat but NOT enough to feel confident enough about to draw a second straight vertical line on the other side of this stud. I did try using a piece of paper under the scanner and that did help in a smother operation, especially on the particleboard, but didn't seem to help with repeatability. I talked with the manufacturer ZIRCON and the bottom line there was to try a thicker slide like the backing of a (pad of paper [the cardboard]) which is a little thicker than what I used (piece of paper) and I will try that. The question that begs an answer now is - Is there anyone who has had the same experiences or frustration that I now share?
Thanks in advance
.... Update: I also recently purchased the STANLEY IntelliSensor and though I did not go to the same extent in comparing I got the same results.