From: ROY RUDDLE <saprar@THOR.CF.AC.UK>
Subject:      Re: PROD: Ultrasonic position sensors
Date:         Mon, 30 Oct 1995 15:49:08 +0000


I'm not sure they are any more accurate then magnetic trackers and, of
course, they suffer from line of sight restructions. However, if you
do want one then try Logitech (UK I have is
steve_baker@uk.logitech.com)

roy