The Gas Monitors e-learning course, Professional download version can be installed on any TWO PCs (say one on your office desktop and the other on your home laptop). This program enables you to learn all about Gas Monitors (also known as Gas Detectors). The course includes principles of operation of different kinds of sensors such as Catalytic,Electrochemical, Semiconductor, Infrared and PID types, selection of sensors, detailed explanations of terms such as LEL, STEL, TWA and similar, calibration and testing of gas monitors and systems, placement, installation and maintenance.The license also entitles you to get Certified for free when you take the Abhisam online Certification test for Gas Monitors, within one year of purchase.