QTHP-3KPSIG-FL 5kpsi / 35 MPa Hydraulic hand pump, 3,000 psi FieldLab Hydraulic hand pumps from Ralston Instruments are designed and manufactured to our highest quality standards. The hand operated hydraulic pumps are versatile in nature and can be used to generate pressure up to 350 bar or 5000 ps for field testing. Quick test adapters ensure quick and efficient connection between a calibrator and a process connection.