This course is focused on the first responder and how to use a meter properly and understand the readings they see and the implications of such on an emergency response. Attendees will participate in lecture, case studies, and hands-on meter training involving common DOT transported chemicals. Upon completion of this course, the first responder will understand calibration and bump testing importance as well as peak readings, STEL, and fresh-air calibration of a meter. Through this program the attendees will learn about each individual sensor in the 4-gas meter (LEL, O2, CO, H2S) so they can better understand what their meter is telling them while on an emergency response on highway tanker accidents, as well as gas leaks, confined space, CO and other calls where first responder safety could be at risk. They will understand and physically experience the meter alarms during the hands-on portion of the class. This course is not designed to make the first responder an offensive responder but to better prepare the member to detect the presence of danger in order to ensure the safety of their crew and the public and to instill the need for air monitoring in order to prevent firefighter cancers.