Hello all,
  I'm looking for a quartz or pyrex round window, 4.5 inches in diameter,
0.25 to 0.5 inches thick.
Does anyone have any idea where to buy such a thing?

David Nemeth
Process Engineer
Sophia Wireless, Inc.
14225-C Sullyfield Circle
Chantilly, VA
Ph: (703) 961-9573 x206
Fax:(703) 961-9576