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In many times we use our bare hand to feel the cold and hot in many things especially water. and because of that many accident such as scald burn occurs.thats where my idea comes in, no more touching, no more putting our hand in danger. Solution
If it is able to combine with LED which is a mature technology nowadays. starting point can be by sensing the water's temperature and triggers different color of LED letting the user know if the temperature is what we wanted.