The best has gotten better! The new “double-wall” bellows system dramatically reduces hydraulic failure. This product is guaranteed for 5 years - comes with case. Baseline hydraulic hand dynamometer gives accurate grip strength readings without the subject being able to "feel" the handle move. Internationally accepted design ensures reliablility, user convenience and measurement repeatability. Maximum reading remains until the unit is reset. Five position handle and body design yield results that are consistent with published Baseline and Jamar studies. The strength reading can be viewed as pounds or kilograms. CE Certified. Standard: 2.5" head. 200lb. HD with case.