For monitoring temperature in processing trays.

With angled stem and hook for hanging it on tray’s edge. 

— Alcohol-filled bulb. 
— Centigrade and Fahrenheit scales: 0 ... 50° C/32 ... 120° F. 
— With marking at 18°C/64°F. 
— Length: 85 mm + 40 mm of angled stem (3.3 + 1.6 in.), ø 10 mm (.4 in.)