The ST350EX is an all-round gas detector and useful for many applications. The heart of the detector is a replaceable gas sensor. This sensor is available in various versions, such as a SCV and a SCF sensor. The SCV sensor is suitable for the detection of Aromatic Hydrocarbons at ppm level (for example Toluene or Xylene) and also for Carbon disulfide (CS₂). The SCF sensor is suitable for the detection of synthetic refrigerants (H)CFK’s and HFK’s. These are well known Freon’s such as R134a, R407c and the newer type R1234yf. Both the SCV and the SCF sensors are stable over their entire long life-time. A solid cost of ownership! The ST350EX 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.