The Smartlid system is super simple. Place the lid on a hot cup of coffee. Too hot to drink and the lid turns from a coffee brown to a hot indicating red. Once the coffee cools to a suitable temperature the lid returns to its original color.
Product page here.
SmartLids Tell You When Too Hot to Sip [Cribcandy]
Grew up back East, got sick of the cold and headed West. Since I was small I have been pushing buttons - both electronic and human. With an insatiable need for tech I thought "why not start a blog focusing on technology, and use my dislikes and likes to post on gadgets."