supply and installation of double beam pc controlled uv vis spectrophotometer including pc and online ups , instrument , double beam pc controlled uv-vis spectrophotometer optical system: double beam wavelength range: 190 to 1, 100nm. spectral bandwidth: 1.5 nm or less monochromator: grating type wavelength accuracy:0.5 nm or less wavelength setting repeatability:0.2 nm or less. variable wavelength scanning speed: range may vary from 10nm / min or less to 3000nm / min or higher photometric range: at least -3 to 3abs and 0 to 300%t photometric accuracy:0.002abs at 0.5 abs baseline stability / drift: 0.0003abs / h or less noise level:0.00015abs or less light source: wi and d2 lamps detector: silicon photodiode operational modes: photometric, wavelength scan, time scan, and pc mode. quartz cuvettes: volume 3.5 ml ( 10 mm path length ) : 4 pcs should be included usb cable for pc connectivity