Morphix Technologies has implemented simple color change technology in a hazardous chemical detection device and made it rugged to meet the needs of first responders under real-life conditions. The Chameleon easily attaches the the forearm for hands-free detection of gases and vapors in the air with no need for a liquid sample. The design also eliminates interferences from smoke or particulates. The Chameleon armband is field-configurable, allowing users to decide which chemical threats need detection. The armband is designed for easy on/off to fit any forearm; even over turn-out gear. It can be used for one cassette or as many as ten.