Photometer The Thermo Scientific Spectronic Genesys Visible Spectrophotometer 20 incorporates the latest technologies for reliable results and easier operation. A sleek design houses up-to-date electronics and a grating-based, 1200 lines/mm optical system. The tungsten-halogen lamp offers approximately 1000-hour lifetime. The spectrophotometer features a narrow, 8 nm slit width with built-in filters that are automatically selected for a given wavelength. A large, easy-to-view 2-line, 20-character LCD readout displays data and on-line instructions. Clear messages indicate error conditions. The wavelength (a wide 325 to 1100 nm operating range) is conveniently selected using touch pad arrow keys. Simply select the mode of your choice using the A/T/C key. To run concentration, just follow the instructions on the display! If no standard is available, simply input the factor. The flexible cuvette holder accommodates 10 mm square cuvettes, 10 mm test tubes, and GENESYS™ 20 Visible Spectrophotometer, 1⁄2" test tubes. Optional long-path cell holders are also available. Versatile data output is provided by a built-in, fully functional bi-directional RS-232C interface and built-in Centronics printer port. Key Features Higher resolution with 8 nm slit width and built-in filters Expanded wavelength range 325 to 1100 nm (continuous) Automatic concentration readout eliminates the need for manual calculations Specifications Product Type     Visible Spectroscopes Bandwidth     8 nm Wavelength range     325 to 1100 nm Wavelength accuracy     ± 2.0 nm Photometric range     0 to 125% T, -0.1 to 2.5 A,  0 to 1999 C Photometric accuracy     0.003 A from 0.0 to 0.3 A, 1.0% from 0.301 A to 2.5 A Photometric noise     < 0.001 A at 0 A, < 0.002 A at 2 A Photometric drift     < 0.003 A/ hour Detector     Solid-state Output     Bi-directional RS-232, Centronics® printer port Beam Type     Single Stray light     < 0.1% T at 340 and 400 nm Source lamp     Tungsten Description     U.S. plug Display     LCD CE Compliance     Yes