The pinch gauge uses a hydraulic system to assure convenience, product reliability and measurement accuracy and repeatability. Therapist can support the pinch gauge during testing, yielding a more accurate result for all pinch tests. Use for tip, key and palmer tests. Maximum reading remains until the unit is reset. The Baseline pinch gauge is made in USA and the results are consistent with published Baseline and Jamar studies. The strength reading can be viewed as pounds or kilograms. CE Certified. Comes in a protective carrying case.