Hi Bob, The one I had initially could not detect easily with thick concrete walls, as in basement of large buildings. Eventually, I looked around a bit search= ed at a few stores. At one store, I did find a tone detector with more sensitivity, which could detect cables buried deeper than 1 feet inside. I haven't come across cables buried about 1m in depth in concrete yet, and since haven't tried to detect something as you state. IIRC. once I was at stadium, where the Chief Engineer wanted to check for cables prior to drilling, (the walls were too thick, metres thick, he knew = that very well). He insisted that the area be checked with their own Cable check= er, It did find any cables in that area though. He went on to discuss how expensive that piece of equipment was and so on. I had a brief look at that instrument, It was a Bosch make with a LCD on it= , All the standard tone testers have a tone transmitter and a receiver, 2 separate units. The Bosch one is a single unit type, which works more like a metal detector. I did a quick google now on the Bosch and as memory serves, it do= es look something similar to the one I have seen. http://www.bosch-professional.com/gb/en/gms-120-23317-ocs-p/ But as I look at it's specifications, I do see that, it detects objects at = a maximum depth of 12 cm, still not yet up to your requirements. I guess you can make a small piece of equipment of your own, with a cassette tape head and an oscillator. You can even employ off the shelf tap= e head preamplifiers too, to get improved sensitivity and so on. Just some id= eas to spark you off .. :-) It does need to be experimentally trialled with a cable which is buried at = 1m depth and the preamplifier sensitivity ... ... Just an idea, which came to mind, in case you don't find any standard equipment that you can buy off th= e shelf at an affordable price .. Best Regards, Manu On Wed, May 15, 2013 at 9:33 PM, Bob Blick wrote: > Hi Manu, > > I was thinking that would work but didn't know how deeply buried it > would still detect. The cable I'm looking for is almost 1 meter down in > some places. > > Thanks! > > Best regards, > > Bob > > On Tue, May 14, 2013, at 10:11 PM, Manu Abraham wrote: >> Hi Bob, > >> I used to trace my satellite coax cables, telephone cables and ethernet >> cable installation at my office with a Tone tester. It wasn't that >> expensive >> as you mention. I have 2 such devices, one of them has a better >> sensitivity. >> Nevertheless, it looks somewhat similar: >> >> https://www.theelectricaltoolstore.com/tenma-tone-generator-probe-set-ca= ble-locator-p-204.html?zenid=3Dvnt2t68vdjtffs7u3r9abdvgq4 > > -- > http://www.fastmail.fm - Or how I learned to stop worrying and > love email again > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .