Gro Egg2 Ambient Room Thermometer. The Groegg is back and is bigger, and better in every way! It's larger, brighter design which makes it even easier than before to check your little one is resting at the correct temperature. The innovative Groegg2 changes colour depending on the temperature and has an easy to read temperature display. The Groegg 2 has adjustable brightness allowing it to be used as a nightlight or to find a light level that suits your baby.