Illumination probe FX-100 is designed for accurate illumination measurements of traffic, work and living areas, following physiological perception of human eye. This spectral-sensitivity model is followed by cosine-corrected sensor within 5 % of error. Measuring range is selected automatically in co-ordinance to illumination. Probe is connected to the computer via serial interface for power and data display or logging. Dedicated application keeps measurement statistics and plots polar illumination charts.