The forecast for future market trends, called for a doubling of the size of the market in the next five years, in particular in the UV-C range. This forecast growth should increase even more than predicted due to recent stricter disinfection regulations in the pandemic situation. Instrument Systems has developed three calibration standards in the ACS series for the three UV ranges A/B/C. The ACS 570-24 covers the UV-C range. The typical radiant flux lies here between 40-60 mW, the peak wavelength at 280 nm.