Startup Idea: Dynamic Multi-Unit Converter App Idea

Startup idea to develop a mobile application that allows engineers to dynamically convert units of measurement (such as length, volume, weight, etc.). The unique feature of this app would be its ability to show the equivalents of all other units of the same measurement type corresponding to the initial unit of conversion chosen.

As an engineer, I often come across a situation where I need to convert units. This is obviously no problem, especially at a computer, because I can simply say convert x mm to inches> However, I have encountered a few situation when out in the field where it would be nice to have an app on my phone in which I could choose a unit to convert from and the app would dynamically show all other units of that measurement type (i.e. length, volume, weight) and their equivalents to the initial unit. Among other things, this would greatly help in choosing the appropriate units for a given situation. I figure this would be a fairly simple app to develop and the largest part would most likely be the UI. Anyway, thank you!. I have searched for dynamic unit converters and multi-unit converters but with little success. I currently just convert to multiple units one at a time.