and white films used in graphic arts, photography, x-ray, microfilm, and scientific

applications. The capability of reading up to 6.0D allows the unit to measure

densities of the darkest films. The TBX has been designed for user convenience and

error-free measurement. Table illumination facilitates film placement. When the

film sample is placed over the table aperture and the probe depressed, density

readings are displayed on a 7-segment LED. A “null” switch permits density

difference readings to be made. A standard serial RS-232 port provides output

connection to a printer, computer, or process control system.