Our series of rechargeable portable Ambient Gas Detectors are rugged, easy to use and have visual and audible alarms that notify the user when gas levels exceed specified limits. They can be calibrated by the user based on the type of environment being tested. They include a power supply to recharge the detector, as well as sample tubes that can be used to test the detectors against a standard reference gas. They come in hard protective metal cases with cushioned, molded foam interiors for device safety, storage, and portability.