The high-precision luminance meter MAVO-SPOT 2 USB for distance measurement with a 1° measuring angle is classified in Class B according to DIN 5032-7, IEC 13032-1 Annex B and CIE 69. It measures the brightness effect of a luminous surface in candelas per square meter (cd/m²), taking ambient light into account. It has an excellent adaptation to the spectral brightness sensitivity of the human eye V(λ) and with a low deviation of f1' < 3%, it significantly exceeds the requirements of the standard. The measurement object can be precisely aimed at through the reflex optics with a 15° field of view and a sharply marked 1° measuring circle in the center. The distance setting ranges from 1 m to ... Shorter distances starting from 34 cm can be achieved using optional close-up lenses. Alternatively, a measurement using a high-quality optional measuring head is possible. With the convenient one-handed operation, measurement functions can be selected and measurements started. A button press activates the display in the viewfinder and its backlighting. Particularly advantageous are the comparison and ratio measurements, where the deviation of a measurement value B from a reference value A is assessed and displayed. The ratio A/B is used for contrast measurement at the workplace. The percentage deviation %A allows for the assessment of the uniformity of screens or the illumination of projection screens.