The HPP series precision calibration pumps (photo) are available in four models. The HPP-100 and HPP-VAC are economical pumps designed for 0 to 6.9 bar (0 to 100 psi) and 0 to –.95 bar (0 to 028 in. Hg) vacuum, respectively. Both models feature dual O-rings on all pistons for smooth operation with zero leakage. The HPP-600 is a pneumatic pump that can generate both vacuum and pressure. It covers a range from –.95 bar (28 in. Hg) vacuum to 41 bar (600 psi) pressure. The HPP-10K hydraulic pump can generate pressure from 0 to 690 bar (0 to 10,000 psi). It is compatible with most hydraulic fluids, oils and water. All pumps are designed to provide long-term reliability in harsh environments, making it ideal for use in automotive, chemical and petroleum industries. — Omega Engineering, Inc., Stamford, Conn.