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Goodman Jack

The Goodman Jack is a borehole tool used for estimating the deformability of rock masses in-situ. It is designed to be used in 3"" (76 mm) boreholes. The Goodman Jack consists of a hydraulic jack with curved bearing plates, LVDT sensors, a displacement indicator, a hydraulic pump with pressure gauge, hydraulic hose, electrical cable, and a coupler for drill rod


12123 Harbour Reach Drive, Mukilteo, Washington, USA 98275, Tel: 425-493-6200, Fax: 425-493-6250, e-mail:

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