Controlled critical environment thermometers and monitoring equipment verify temperatures in hospitals, clinics, and laboratories and are kept within specified ranges to prevent samples from spoiling. Critical temperature analog bottle thermometers consist of a liquid-in-glass thermometer inserted into a small bottle filled with liquid or pellets used in environments like laboratories and blood banks to monitor the temperature of vaccines and temperature-sensitive samples. Digital models use an external sensing bottle, bullet, or insertion probe connected by cable or wireless connections to the digital display. Critical environment temperature alarms are audio, visual, or both audio and visual alarms that alert people when temperatures are not within set parameters.