A HIGH-SPEED NONCONTACT TUBE GAGING SYSTEM IS IMPLEMENTED THROUGH THE USE OF BACKLIT STEREOMETRIC PASSIVE CAMERA TECHNOLOGY. THE SYSTEM IS COMPLETELY EYE-SAFE, AS NO LASER ILLUMINATION IS REQUIRED. THE SYSTEM IS COMPLETELY AUTOMATIC AND MECHANICALLY SAFE AS GIMBALED MIRRORS CAN DEVIATE THE CAMERA LINE-OF-SIGHT. THE SELECTION OF THE APPROPRIATE COMPONENTS CAN BE MADE TO SUPPORT AN EXTREMELY HIGH-SPEED OPERATION. SINCE NO TUBE FIXTURING IS REQUIRED, THE COST SAVINGS ALONE MAY BE SUFFICIENT TO JUSTIFY THE COST OF THE INCORPORATION OF THIS TECHNOLOGY INTO A TUBE MANUFACTURING PROCESS.