The monochromator comprises a dispersive element, an entrance slit and mirrors to create a parallel beam similar to sunlight, and an exit slit and mirrors to extract the monochromatic light. The prism and diffraction grating are typical dispersive elements. Table 1 shows their. In this volume, we will describe the monochromator, an important part of the spectrophotometer that was explained in UV TALK LETTER Vol. 1 Construction of a Spectrophotometer Light containing various wavelengths can be broken down according to the. Two types of UV-VIS Spectrophotometers are available: the single monochromator type and the double monochromator type. But why are two types available? This explains the. A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider range of wavelengths available at the input. A. HOLMARC's Spectra Quasar Series Monochromators Model : HOSP-SQR500FA, HO-SP-SQR300FA & HO-SP-SQR200FA are fully automated, triple grating instruments with dual output port while Models HO-SPSQR500F, HO-SP-SQR300F & HO-SP-SQR200F are single grating instruments with single output port.