Optical System-Single Beam,Grating 1200 Lines/mm,Wavelength Range-320-1020nm,Wavelength Accuracy-2 nm,Wavelength Repeatability-±1 nm,pHotometric range-0 to 200%T,-0.3A~3A,pHotometric Accuracy-±0.5%T,pHotometric Mode-T,A,C,F,Wave length setting-Manual,Spectral Bandwidth-2nm,Stray Light-≤0.3%T,Stability& Baseline flatness-0.004A/h@ 500nm,Cell Holder-4-cell Holder(10/50mm),Noise-±0.2%T,Display-LCD Screen with backlight,Detector-Sillicon pHotodiode,Light Source-Tungsten lamp,Output-RS-232C,Power supply-220V/50Hz,Overall Dimension (W×D×H)-520×460×310mm,Weight-10kg.