This bimetal Fahrenheit & Celsius degree button thermometer is very durable with ABS case and transparent top. It can read temperature from 0 to 120 degree. It has groove on the edge for lanyard. You can also stick it with water glue on calendar, book, camping kits, etc. This thermometer can test temperature range from 0 to 120 Fahrenheit degree -20 to 50 Celsuis degree. It may have +/- 5 degree error for Fahrenheit.
Specification:
Material: ABS plastic, bimetal thermometer spring
Size: 20mm diameter
Type: dry type, no liquid inside