The Testo 545 can measure light levels in workplaces, hospitals, offices and schools in order to compare the measurements to those given set forth in official standards. Average calculation over time, punctual average over 99 measurement points. LCD display with 2 lines and 2 matrix lines. Up to 99 measurement place selections. Save function (3000 measured values). Printing of all functions and memory to infra-red printer (option). Silicone photodiode sensor.