‘sunburn monitor wristband’ by the university of strathclyde in glasgowdeveloped at the university of strathclyde in glasgow for intellego technologies,  a ‘sunburn monitor wristband’ is able 

to help prevent over-exposure to the sun by indicating to users when they have been exposed to a certain amount 
of UV radiation. the monitor works by changing from yellow to pink, acting as a visual reminder as the risk of 
contracting a sunburn increases. the system operates through an acid-release agent which picks up ultraviolet light
and a dye which responds to pH levels in the indicator.

sunburn monitor wristband by the university of strathclyde