If for some reason you're not capable of reading numbers, this Grobag Egg shows you the temperature in easy to "read" colors. Blue if it's cold, yellow and orange if it's somewhere inbetween, and red if the roof is on fire. Of course, unless you suffer from congenital insensitivity to pain with anhidrosis, or NAMBLA, you should be able to detect the temperature from your own thermometer known as your body.
However, this Grobag Egg is supposed to be placed inside nurseries, so that you can easily determine how hot or cold a baby's bed is and adjust accordingly. But it's still a pretty neat gadget to place on your nightstand so you can determine just how fast you need to run to put on a jacket when you get out of bed in the morning.