However, the original inventor of the Pomodoro technique explicitly advocates a "low tech" approach - a mechanical kitchen timer, because he argued that the tactile and auditory elements (i.e., the turning moves and ticking sounds) get associated with the elements of the techniques in the human brain.
It would be interesting to evaluate both variants of the approach in a scientific experiment.
This product (1) is not just for Pomodoro and (2) has nice tactile hardware.
I think hardware that can "passively" be more useful with sensors and similar are easy wins. No reason it has to disrupt a timer, it just hides sensors you'd want within a device that would already be sitting out in your home/office.
However, the original inventor of the Pomodoro technique explicitly advocates a "low tech" approach - a mechanical kitchen timer, because he argued that the tactile and auditory elements (i.e., the turning moves and ticking sounds) get associated with the elements of the techniques in the human brain.
It would be interesting to evaluate both variants of the approach in a scientific experiment.
https://www.amazon.com/-/en/38-1005/dp/B00335P518 - about €7 or $13, depending on your geography