This project stems from the need of the "forest mechanizers" group of DAGRI (University of Florence) to evaluate, within a working shift in the forest, how much time is used for each phase. That is, at the end of the day, you want to know how much time was used to cut down the trees, how much break time, how long the tools were set up, etc. The program can obviously be used in any work environment and not. For each phase it is possible to assign a name. The stopwatches are cumulative for each individual phase. The applications are many. It is necessary whenever it is necessary to start a stopwatch and pause another. In all there are 16 chronometers with precision of the second.