The Desgranges et Hout CPB 6000 (Formerly DH model 5000) is used world wide as a primary pressure standard.
Special spring-balanced low-volume valve assemblies with simple on/off indication provide extremely high levels of reliability and accuracy compared to standard soft-seat needle valves.

Piston float indicator allows optimal accuracy.
Offering Uncertainties as low as +/-0.002% of reading
Available Pneumatic ranges from 5 kPa to 100 MPa (14,500 psi)
Hydraulic ranges from 200 kPa to 500 MPa (72,500 psi)
Special models are available for differential testing and operation with special fluids such as water.