The ST650EX is an all-round gas detector which functions well under the most difficult circumstances. The heart of the detector is a replaceable gas sensor. This detector is available with various sensors, such as a catalytic flammable (CAT) gas sensor, Infrared (NDIR) a Thermal Conductivity sensor (TCD). And a Molecular Property Spectrometer (MPS). This last sensor can differentiate 14 different flammable gasses. And compensate for these in real time. The ST650EX is available with or without a graphic display. The version with a graphic display, shows the measured value and various status notifications locally. The capacitive key control gives you an experience similar to a touchscreen and enables easy navigation through the user/calibration menu. The user menu is secured with a password; unauthorized users cannot access the gas detector. The control of the user/calibration menu does not require additional tools (for example magnets). Simple, easy and user friendly!