This sensor is designed to be used in UV disinfection units and is suitable for monitoring of UV dose of UV lamps according DVGW work sheet W 294-3 (issue 4/2005). It is designed as a plug in sensor. Sensors of this type are  very precise and have a small aging effect. The calibration is traceable to a standard of the Physikalisch-Technische Bundesanstalt Braunschweig (PTB