Temperature Sensitive LED Shower Light
So we’ve seen the temperature sensitive faucet light, but that’s useless for those with stand alone showers. The Temperature Sensitive LED Shower Light does exactly what you’d think: emits red when hot and blue when cold. The only problem is that it emits red at a single threshold: 89 F. Ideally it would emit 3 colors, one to indicate scolding or unsafe temperatures.
Available here for $45.