... .9%T,A:0~1.999Abs,F:0~9999,C:0~9999Photometric Accuracy: 0.5%(τ) (NBS SRM930D)Photometric ... 5minSELON SE-722 VISIBLE SPECTROPHOTOMETER, Wavelength setting, multi-point curve calibration Visible Spectrophotometer, portable spectrophotometer, spectrophotometerFEATURES:1,Wavelength ... concentration readout directly with up to 50 sets of curve parameter and testing data stored4,System clock management, ...