That was kind of his point though. In order to deactivate one side you have to program that in the UI. Also, if you provide this kind of forced directionality t

That was kind of his point though. In order to deactivate one side you have to program that in the UI. Also, if you provide this kind of forced directionality to the two temperatures, you now how to make the units toggle on each side ( otherwise you can only convert from one fixed choice to the other - eg. C to F but not F to C ). As soon as you start asking these questions, the UI requirements change.