It is the turtlemeter at Amazon, by Ozeri - an American company trying to branch out into the UK at the moment. They pride themselves on making attractive, durable and practical items; All necessary points for a product to enter our house! I was still surprised at the quality of the item, the design, just how chunky he was (perfect for little hands to hold) for the price that he is - £9.99. **I keep calling it: "he" ... can't help it, he is just so cute.
Grab yourself one here and you might even see my Amazon review. If not, read it below anyway:
"The turtlemeter looks cute enough on the pictures, but even so I was impressed with the quality and the design when it arrived. It is quite large, solid and the glow from the lights is superb. It comes with a digital display and 3 coloured lights which change as the temperature of the water rises or falls, using 3 metal buttons at the bottom. My 14 month old loved it right away and my 7 year old loved seeing it change, wanting to know how it worked. I initially tried it out in a cold bath, hot water running, to see how quickly the colour changed when hitting different temperatures; Conclusion? Immediate. The temperature not only goes up in degrees but to a decimal, so you get a reaction and a completely accurate gauge as to whether the bath is the right temperature or not. "He" also floats about the bath, smiling away, telling you whether maybe a cold spot has appeared, or if you need to give it a good stir before the kids get in the bath. Once in, it make a lovely bathtime addition."