Linshang LS117 Optical Density Meter Test Dot Area Aluminum X-ray Film With OD  Visible light Transmittance Replace X-rite 341C Measurement: 1: All graphic arts film, measuring absolute optical density and relative density and dot area 2: X-ray film, aluminum film materials etc, measuring absolute optical density. 3: All kinds of milky white, fog material, measuring light transmittance. Parameter: 1)  Density Measuring range:  0.00 --- 6.00 OD 2)  Dot Area Measuring range: 0 --- 100% 3)  Resolution: 0.0005% Transmission / 0.01 OD 4)  Density Accuracy: +/-0.02 (0 -2.00 OD) +/-2% (2.00-6.00 OD) 5)  Transmittance Accuracy: +/-1%(0% --- 50%) +/-2%(50% --- 100%) 6)  Aperture: 2mm 7)  Light source: ANSI/ISO Visual 8)  Power supply: 4*AAA alkaline battery(not included package) Features: 1)  Completely self-contained operation. No independent power supply or light source required. 2)  Ideal for all graphic arts film applications, from quality control to calibration. 3)  Directly measures density, density difference and dot area. 4)  Simple to operate and easy to use 5)  Able to measure densities up to 6.0 OD