The invention described herein is a submersible digital slate for divers that incorporates a power supply, a keyboard or keypad for text entry and a display screen for displaying text that can be attached and detached from a body-mountable retaining band or strap. The electronic device may include a memory, a display unit, and a controller. The x-ray probe beam can also be modified to increase the speed of evaluating the thin film sample, for situations where some degree of resolution can be sacrificed. A high mobility conducting path is used to read data quickly, while very small programmable elements vertically integrated in one or more planes increase the storage density at no extra area penalty. The tether is operatively connected with an inner end of the beam, while the platform is operatively connected with an outer end of the beam.