It consists of two CIMEL photometers and two PREDE POM radiometers for the measurement of the aerosol column. A Ceilometer and a lidar are also available to study its vertical profile.

The Cimel is a filter sunphotometer equipped with a double collimator with a 1.2º Field of View (FOV) that allows automatic measurements of direct sun intensity in eight spectral channels (340, 380, 440, 500, 675, 870, 940 and 1020 nm) and the sky radiance in four of them (440, 675, 870 and 1020 nm). The Full Width at Half Maximum (FWHM) of the visible and near infrared channels is 10 nm, and 2 nm for the ultraviolet channels. The 940 nm channel is dedicated to obtaining the columnar water vapour content (CWV), and the rest of them are used to determine the aerosol optical properties. The Prede POM radiòmetres have a similar design to CIMEL CE sunphotometer, although the specifications (wavelengths, field of view, etc) are diferent.