Premo seems like an interesting tool to learn from when dealing with emotions measurement.
Emotional responses elicited are difficult to measure because their nature is subtle (low intensity) and often mixed (more than one emotional response at the same time). However, scientific research at the Technical University of Delft by Dr. Pieter Desmet has resulted in an instrument, PrEmo, to measure emotions. Since then, PrEmo has been further developed by SusaGroup and TUDelft, resulting in a new and improved interface and character.
Discover all about it on Premo Website