There are a number of solutions you can use to track tools. The solution chose is going to depend on your business case. Are you looking to track tools at a work site? For check-in/check-out? Inventory management? etc.
There's a couple things you can take a look at to give you some ideas:
Ford work Solutions has a product called Tool Link from DeWalt that uses EPC UHF RFID technology to tell you what's in your truck and what isn't. There is a video here:
http://www.youtube.com/watch?v=3Soz7bkzPe4Plus, there are a number of different type of durable asset tags you can use. You can read a benchmark with more detailed technical information here:
http://rfidwizards.com/index.php?page=s ... Itemid=392Can you provide a little more background on your business requirements and how you could benefit from improved visibility of your tools?