Mike I suggest you contact Francois Monette at Cogiscan (_www.Cogiscan.com_ (http://www.Cogiscan.com) ). They are masters of RFID and material handling, specifically for our industry (RFID enabled smart feeders, MSD, etc). RFID is the way to go, in general. Off hand, I know of RFID tags that survive bake-out temps (per J-STD 033) but not so sure about reflow. Phil Zarrow ITM Consulting Durham, NH USA _www.ITMconsulting.org_ (http://www.ITMconsulting.org) --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------