Electric or electronic sensors for gas and air; Electric sensors; Electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; Electrical sensor apparatus for sensing the presence or absence of individuals or objects by contact or pressure; Electronic data relays for sensors; Electronic proximity sensors and switches; Electronic sensors for measuring solar radiation; Environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; Gas detectors for detecting the presence of gas; Gas sensors for measuring gas concentration; Industrial calibration sensors; Infrared sensors; Remote sensors for use in measuring thermal and infrared radiation energy waves; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Sensor chips for scientific use; Sensors for determining position, velocity, acceleration and temperature; Sensors for measuring chemical levels in aqueous solutions, not for medical use; Vibration sensors