There are currently 25 different XS sensors available that can measure over 50 different gases and vapors. XS stands for "eXtra Stability", meaning these sensors require less frequent calibration than competitive sensors.
XS sensors are intelligent sensors that can be interchanged between the Pac III, MiniWarn, MultiWarn II and X-am 7000 monitors. All sensors-related data, including measuring ranges,calibration, alarm set points, etc. are stored in the sensor memory and transferred to the next instruments. XS sensors include advanced technical features such as internal temperature compensation, outstanding pressure compensation and user-changeable internal cross-sensitivity filters. These improvements provide more accurate measurements than other brands. The CO, H2S, and O2 versions of the XS sensors carry a 3 year warranty and only require calibration on an annual basis.