TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Container: The gauge further comprises a pressure gauge in fluid communication with the enclosed canister.The pressure gauge has scales for reading the amount of hydrogen stored within the hydride material, each scale being indicative of the amount of stored hydrogen at different temperatures.The pressure gauge further comprises an indicator, for providing an indicating characteristic to enable observers to choose the appropriate one of the scales which corresponds to the ambient temperature of the hydride material in the canister.The canister further comprises rigid chamber disposed adjacent the canister wall, having an inner portion in fluid communication with the space enclosed by the canister wall, and an aperture visible outside of the canister wall, and a fuel indicator disposed within the aperture in the fluid indicator being capable of indicating the capacity of hydrogen gas stored within the metal hydride material disposed in the canister.The metal hydride is in longitudinal communication with a pressure sensitive element disposed adjacent the aperture, whereby volumetric changes in the hydride material within the chamber cause corresponding changes in the pressure exerted by the hydride material as a result of physical expansion caused by absorption of hydrogen by the hydride material.The fuel indicator further comprises an enclosing pressure sensitive plastic capable of changing color as an indication of the hydrogen capacity of the hydride material in the container.The fuel indicator further comprises a piezoelectric member which produces an electrical signal indicative of the pressure exerted by the metal hydride material in the chamber.The metal hydride material in the chamber is identical to the hydride material in the space enclosed by the canister wall.The hydrogen storage container further comprises a temperature sensor disposed within the container generating an electrical signal indicative of a temperature valve, the piezoelectric and temperature sensor processor being capable of calculating the value of hydrogen capacity based on a predetermined algorithm.A digital display is also included for receiving a value of hydrogen capacity calculated by the central processor and for displaying the value on the display in digital format.    TECHNOLOGY FOCUS - POLYMERS - Preferred material: The chamber further comprises rigid walls of an insulating material permeable to hydrogen gas, the permeable material further comprises a polymer, more preferably Teflon (RTM: polytetrafluoroethylene).