Paroscientific manufactures high accuracy, high stability standalone Barometry standards in various form factors.
Digital indicators and intelligent transducers are equally popular.

Paroscientific barometers are pressure sensors with special ranges and extra high accuracy crystals.
Barometric Range: 50 to 110 kPa
Pressure Accuracy: 8 Pa or better
Achievable Pressure Resolution: 10 ppb (0.001 Pa) or better