UV Thermometer Card
There might be nothing worse then being sun burned. In seconds the UV card displays the UV level on a scale of 1 – 8: 1-3 low, 4-6 medium, and 7-8 high. Probably not thin enough to fit in a wallet, but it should slip into the back pocket with ease. Ideal for places like LA, San Diego and other sun scorched areas of the world. After all, you can never be too careful, especially on a cloudy day. Also displays the temperature.
Available here for $11.50