Overall appreciation 1. A short description of the 3 instruments 1.1. For this report, only the UVB sensor was used. In this report, the UVB sensor was always pointing straight upwards into the sky by holding the instrument in a vertical position. A second small reading in the LCD display shows the UVI index.
Readings vary remarkably with the orientation of that window in respect to the sun.
In this report, an orientation which gave a maximum reading was always used. This corresponds more or less to the sensor element being placed perpendicular to the infalling sun rays. In this report, the instrument was always held to give a maximum reading, which was the case when the sensor was perpendicular to the infalling sunrays. Under a flip-up cover, the instrument contains a small numeric keypad, which makes it usable as a calculator. The UVB Biometer of the meteorological station of the Lyc e Classique de Diekirch was used as a primary reference.