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Solar lightest 540 model Micro tops II photometer is a light weight, portable 5 channel instrument for measuring aerosol optical thickness, direct solar irradiance, and water vapor Column easily, accurately and dependably. This multi-spectral device is designed to measure direct solar irradiance at all selected wavelengths. It then uses this information to provide atmospheric properties, such as aerosol optical thickness and water vapor Column. this photometer is equipped with our most popular filters - 440nm, 675nm, 870nm, 936nm, and 1020nm. The unit features accuracy comparable to much larger and more expensive instruments.