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I have a damp web that I would like to measure the thickness of. The resin in the web contains MEK. Therefore I need explosion proof, non contact, and do not have a fixed roller to measure from. I can get my sensors fairly close to the web - within an inch if necessary. We would like to measure within 0.0005 if possible. I am considering two opposing lasers, or opposing ultrasonic sensors. I am unable to find either of them with an explosion proof rating. Any suggestions greatly appreciated. Regards, Art Bourdeau Web: www.bcsco.com Phone: 518-765-3667 Fax: 518-765-4033 Mobil: 518-573-4745