Pressure sensors; pressure gauges; calibration systems composed of a calibration device for calibrating pressure and temperature measurement instruments in the nature of a temperature output well for generating a reference temperature to calibrate thermometers and similar temperature measuring devices; barometer test kits comprising low pressure test pumps being testing apparatus, pressure gauges or sensors; test chambers, namely, enclosures for proof and burst testing of closed-end, pressurized instruments; superpressure fittings, namely, component parts and fittings for calibration devices for calibrating pressure measurement instruments and systems in the nature of threaded metal fittings and tubing assemblies; testing equipment for measuring pressure in the nature of test hoses for transferring pneumatic and hydraulic calibrating pressure or vacuum into the test circuit; component parts for calibration devices for calibrating pressure and temperature measurement instruments, namely, quick disconnects in the nature of couplings used to connect and disconnect test hoses, superpressure fittings, pressure measuring devices and components within the calibration test circuit.