Battery packs for use with sensors that detect and measure the presence, quantity, and concentration of gases, pollutants, temperature, humidity, vibration, and motion in industrial and hazardous locations; Downloadable computer software for monitoring and managing environmental sensor data obtained from environmental sensors used in industrial facilities and hazardous locations; Electric or electronic sensors for measuring and detecting the presence, quantity, and concentration of gases, pollutants, particulates, temperature, humidity, vibration, and motion, and modular battery packs, data storage devices, electronic transmitters and receivers sold as a unit for use in industrial and hazardous locations; Power supplies for environmental data sensors and for electronic data transmitters and receivers used with environmental data sensors; Sensors for measuring presence, quantity, and concentration of gases, pollutants, temperature, humidity, vibration, motion, in industrial and hazardous locations, not for medical use; Environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; Gas sensors for measuring gas concentration