I am looking possible alternatives to labels e.g.
which are indicating temperature. I am looking for the cheapest way of measuring and also need some visualization that confirms temperature. This label cost around 0,5 €.Change-of-State Temperature Measurement Devices
Change-of-state temperature sensors consist of labels, pellets, crayons, lacquers or liquid crystals whose appearance changes once a certain temperature is reached. They are used, for instance, with steam traps - when a trap exceeds a certain temperature, a white dot on a sensor label attached to the trap will turn black.
Are there any cheaper products for measuring temperature?
Thx.