Customer Rating: 
Summary: A Few Tips for Wood Lath & Plaster Walls
Comment: This i65 unit from Zircon works very well, based on my experience. I have been remodeling a very old home for three years, and it included removing and working with existing wood lath with plaster walls.
Conventional wisdom says none of the modern-day Stud Sensors work with wood lath and plaster walls, and the reasons cited include...
1) The rows of wood lath can vary in thickness -- thereby, throwing off the reading depth of the sensor.
2) When plaster is applied, it is forced through the gaps in the wood lath and builds up behind the lath to lock the plaster to the wall upon drying. These varying thicknesses also throw off the accuracy of these stud sensors.
Yes, I agree with all of that on merit -- but I've used the i65 successfully after realizing a few things. First of all, many owners never bother to read the instructions, and try to use these devices too quickly. Here are a few tips that might help...
a) Set the unit flat against the wall and press and hold the left-side button. This will result in a flash of its red locator light and a short beep. This sets the initial depth reading.
b) Keeping the unit pressed against the wall, continue pressing that button (do not release it after setting the depth)-- then start sliding it slowly on a horizontal line parallel to the floor. When you reach the leading edge of a stud it will show the gauge on the device, and when you reach the center of that stud the red light will come on indicating that centerline.
c) If the device fails to locate a stud within 16 inches of your starting point (typically, more like within 8 or 12 inches) a few possibilities could have occurred: 1) You started off directly on a stud by chance. 2) You moved the device too quickly. 3) You hit large pockets of plaster by chance.
Solution?
Move the device down (or up) about an inch from your original level, reset the depth reading as described earlier -- and try again.
Using this method, my i65 read accurately thru a layer of 1/2" drywall on top of cracked deteriorating plaster of about 3/4" thickness, and that was on top of 3/8" thick wood lath -- finding the studs accurately nearly every time. Do you get the occasional misread? Yes. But the device acts differently when that happens.
For instance, the red light may never come on.
This is a sign of moving too quickly, or of hitting an odd pocket of very dense plaster during the initial read -- in my opinion.
Or it may show a narrow gauge reading on the screen, which quickly disappears. Again, slow down and maintain an even horizontal movement as best you can, shifting its position.
Believe me. I've been working on this old house for 3 years. This device definitely works! And if you ever hear me mention the word "remodel", again, please SHOOT ME!! 8-) I'm sure I'll be happy once this ordeal is through. But there have been a few tools which I've bought during this time that actually WORK -- and this is one of them.
The other, invaluable remodeling tools I've purchased include DeWalt battery-operated circular saw and drills, Milwaukee Sawzall for ripping out pipes (corded is best, with the rotating handle), and my Makita combination saw. Give credit where credit is due! Zircon builds a good product.
Customer Rating:
Summary: Gotlucky
Comment: Great tool. I did not know what to expect, and was pleasingly surprised. I would recommend to others.
Customer Rating: 
Summary: Not very good
Comment: I have textured wall. Even using the tool the way suggested by the manufacturer, I have really inconsistent results. About half the time the "stud" turns out not to be a "stud."
Customer Rating:
Summary: Slow an Go!
Comment: Zircon 60369 Studsensor I65 Onestep Center Finding Stud Finder with "How To" Video Included
It will locate the stud (eventually), but you better double check the reading. The center of stud may not be there, even with the deep sensor mode. It instructs you to move the stud finder slowly over the surface. This will take some time.
I am a new user. To me, it could, and should work better sensing studs, and wires.
Customer Rating:
Summary: Worthless
Comment: I tried this in the store and it seemed to work great on the store demonstrator. I tried it at home on new drywall with 2 coats of paint and it did not work at all. The readings were irratic and not repeatable. I put up the drywall and so I have a good idea where the studs are. This thing was off by 4 inches or more on both the stud and the AC wiring.
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