Product concept done in 2010, the Messen B voltmeter. The objective of this project consisted of the prototyping of a small smart equipment while respecting the aestetics of Dieter Rams, designer et Braun in the 50's. The product shows clever and intuitive ergonomics for the interaction human / machine, especially for the simplification of the interface with graphic pictograms and for the fixing of the machine on the wrist during measures.