The people you should ask are those who track small animals or vehicle locators.

There are probably hundreds of designs out there if you google for an answer.

The othe route is the hidden bug brigade. All you need is a fairly simple two transistor circuit. Try looking at electronics magazines for ads.

I'm thinking of a GPS transplant for members of my staff. That way I can track there movements over the course of a day and retrieve my tools.

Just bulk buy phones with GPS units and rent them out.

Didn't we do this the other day? I liked the idea of the RF tag epoxied to the tools, but I think the range was the issue with it. If you RF tagged the tools and then read the tool box before leaving the job site, at least you would know something was missing before you got back to the shop or went to the next job site. If you really wanted the 100m range, I wouldn't think a small transmitter would be too difficult - the ham radio guys are always doing those T-hunts and they could get very crafty with their transmitters, though it usually all home-brew stuff - I don't recall ever hearing of an off-the-shelf T-hunt transmitter, though I'm sure if you checked the Ham magazines you'd be surprised.

One of method to track and trace of item by RFID technology. you can write more about your application to jeyakumar@syrmatech.com for the HARD RFID tags. YOu can go thro website www.syrmatech.com for more details.

RFID at a hundred meters thats some reader you have found, I thought the whole idea was to keep things local like about 12" 300mm.

The device you need was invented many years ago. It is call Mother, or Mom and they are great for finding lost things, cleaning up and attempting to train young male minds in the art of tidiness.

In my case it didn't quite work but it was a valiant effort.

You got that right! The key word here is ATTEMPTING!

Aussi,

Did you check out the link http://www.loc8tor.co.UK

About 145 Australian dollars (£60) for the basic pack including two tags, and, 30 Australian dollars (£12.50) per tag (in packs of two).

randall i did check it out it looks good am finding out more about it thank you very much by the way i didn't mean to ask the q. twice i forgot i had allready asked.and thanks to every one for there input.

It is being done in SA in mines mainly to track expensive safety equipment. Preventing entry without and warn for missing instruments when leaving.

A big antenna is used, the range obtained is then only about 1 m.

At this stage the cost of such a system will exceed the savings for normal tool replacement.

A special designed toolbox formed to fit the required tools may be serve the purpose better.