Technel has a wide range of barometer manufacturers to choose from with different accuracy levels serving several applications. There are stand alone bench top units or individual transducers available. Mensor has transducers, portable hand-held units and bench top lab models with uncertainties from 100 ppm to 300 ppm of reading. The Honeywell HPB transducer has built-in temperature compensation from -40 to 85 degrees C and meets FAA specification. Paroscientific features barometric transmitters, transducers and laboratory standard barometers with uncertainties to 80 ppm.