The Zipper-Pull Hiking Thermometer by ThermoWorks tracks ambient temperature with accuracy and versatility. It easily attaches to a coat, backpack, or fridge with a key ring. The device features a backlit display, a temperature range from -13°F to 122°F (-25°C to 50°C), switchable °C/°F, IP67 water resistance, auto-rotating display, and max/min temperature memory.