The SPD-20A/20AV is a UV-VIS detector that takes sensitivity to the limit (Noise level 0.5 x 10(-5) AU), and offers wide linearity (2.5AU). SPD-20A: Wavelength range: 190 to 700nm

The SPD-20AV has a mode that allows the deuterium lamp and tungsten lamp to be lit simultaneously, enabling high-sensitivity wavelength-programming detection fro ultraviolet light and the entire visible-light range. Wavelength range 190 to 900nm.