Review on 🐘 Elepho eFloat Digital Baby Thermometer: Accurate Water & Room Temperature Monitor, Kid-Friendly Bath Toy; Waterproof Device Emits Alerts for Hot or Cold Baths (Blue) by Stephanie Young

The perfect bath thermometer. Flashes blue when the temperature is below 90 degrees, the light is off from 90 to 102, and flashes red when the temperature is above 102. There is no on/off button, just shake it or throw it in an empty bathtub to turn it on. After a period of inactivity, it turns off automatically. It always stayed on until the bath was over, so they removed the machine as well. Easy to use, durable, does exactly what it's supposed to do and the handy flashing light lets you know if the temperature is too hot or too cold by looking around the room. Very happy with this purchase.