The Frequency Visa Gift Card tells a good story, if you know how to read it. Oscilloscopes display data of all types in line-graph form that can be interpreted on sight, rather than stopping to think about columns of numbers on a spreadsheet. Oscilloscopes measure variations in signal voltage. Non-electrical data, such as vibrations, can be converted to voltage equivalents and then displayed. These scopes are invaluable in science, medicine, engineering, telecommunications and other industries. Anyone with a scientific bent would like to receive a Frequency Visa Gift Card.