Air quality measurement apparatus, namely, particle counters; Circuit breakers; Electric relays; Electric switches; Hand-held device comprised of chemical and heat sensors for the detection of explosives; Humidity sensor with integrated digital and analog output circuitry used in automotive, appliance and light industrial applications to sense both relative humidity and temperature environmental conditions; Microsensors for measurement of pressure, acceleration, force and flow, namely, silicon piezoresistive pressure sensors; Occupancy sensors, namely, electronic devices which detect the presence of occupants and control the lighting system accordingly; Optical sensors; Portable electronic recorder for measuring and recording multiple voltage, current and thermocouple readings from various transducers; Pressure transducers and transmitters that convert hydraulic or pneumatic pressure into analog electrical signals for monitoring and controlling hydraulic or pneumatic systems; Pressure sensors; Scientific apparatus, namely, sensing and signaling devices for measurement and quality control of materials processing by laser; Temperature sensors; Temperature sensors used in the medical field to measure temperature of medical solutions; Thermostats