These Jenway 73 series single-beam spectrophotometers have improved optics resulting in a narrow spectral bandwidth of 5 nm and absorbance range of 0.3 to 2.5 A. All models feature measurement modes for absorbance, % transmittance, and concentration. Advanced models add spectrum scanning, quantitation, and kinetics. Visible spectrum models have a tungsten halogen lamp with a "lamp save" feature which shuts off the lamp after periods of inactivity. UV/visible models feature a "press to read" xenon lamp to provide accurate readings and extend lamp life. Easily control the spectrophotometers via the RS-232 port and included software.