Bosch Multi Detector
Page 3
The strength indicator shows how close the object is to the sensor which is a ring shaped device inside the top half of the detector. This sensor is ring shaped and has the marking hole and light ring in its center so finding individual objects like nails or screws is possible using both the shape of the scanner and the strength of the signal with the zoom feature.
To test out not only the features of metal detection and how well the detector finds objects but how well it finds individual screws and nails I tried a very scientific test of sticking some screws and nails under my desk and behind a wall. The Bosch Multi-detector did a fair job of showing where the screw was behind the wall through about four inches of plaster and lathe. Finding the exact location of a screw under my desk was totally perfect and worked every time for both a drywall screw and several nails of varying sizes.
Using the zoom feature you can precisely find an object like a screw down to about a half inch circle of precision. By this I mean that I used the zoom feature by holding the zoom button while finding the screw and watching the zoom bars and when the bars were at the top I marked this position on the paper I taped on the desk. I did this several times and then look at the circles I marked which could all fit under a quarter and most were as small as a dime.
I was fairly impressed that the detector could find a metal drywall screw I stuck on the underside of a 1/2 inch thick piece of particle or press board I use as my desk that I stuck with sticky tack hanging down under the board. The detector showed the position of the screw under a circle pattern of markings the size of a quarter to show me the exact location within about a half inch. This is pretty accurate and trying to find the location of one screw behind a piece of material the same thickness of drywall is pretty impressive.
I also located studs inside walls of my house that I had found previously and also hung some shelves in my home and a paper towel holder and fire extinguisher at my wife’s daycare with ease. The Bosch Multi-Detector Kit works exactly as featured on their website but they only give a very brief description and set of features there.