These table top densitometers display transmission density and density difference. The TBX1500 also calculates positive and negative dot areas. Single-Step measurement of Transmission Optical Density and Optical Dot Area The Tobias TBX1000â?¢ and TBX1500â?¢ Transmission Densitometers measures transmission optical density. The TBX1500 also calculates positive and negative dot area. The unite have been designed for user convenience and error-free measurement. The data can be uploaded to a spreadsheet via the USB port using an optional data transfer program (p/n A2128). The TBX1000 and TBX1500 have been designed for user convenience and error-free measurement. Table illumination facilitates film placement and the entire operation requires only one hand, leaving the other free for note taking or sample repositioning. The unit has both an absolute mode and a relative mode, which can be used for comparing the measured values to a previously stored value for consistent process control. B&W transmission densities Calculates positive and negative dot area (TBX1500) Soft key menu operation 7 inch throat to measure large samples Readings are very repeatable with a large degree of accuracy USB port standard Software calibration Optional band pass filter Switchable LED table lamps Cost effective and affordable quality control system