Unit Converter (ver 1.0) manual

Hello. I'm android boy. There are already a lot of Unit Converter apps
on the market. However, most are inconvenient and difficult to use
because of a poor and complicated UI (user interface). For 2 months, I
had tried to develop this Unit converter app that has most intuitive
and simple UI. Try it out. * Introduction video (based on ver 1.0) *
Supported Units list - Basic : length (