This thermometer is Ideal for monitoring vaccines and common fluids stored in refrigerators, freezers, and cold holding display cases. It has a temperature-buffered sensor enclosed in a bottle of propylene glycol solution, which ensures accurate measurements that are not impacted by rapid temperature fluctuations caused by frequent refrigerator or freezer. See https://www.coldchainsolutions.co.nz/…/thermomete…/deltatrak/