Temp-Chex® Red Spirit Refrigerator Thermometer Celsius -5° to +15°C Total Immersion Door / Wall Mount Does Not Require Power (307786_EA) 1/EAProbe in a vial of propylene glycol creates a temperature buffer, preventing fluctuations and inaccurate readings. Individually serial numbered and NIST (National Institute of Standards and Technology) traceable Enclosed in a durable plastic case to contain contents in case of breakage Measures temperatures from 90 to 50 C Can be mounted magnetically or adhesively Scaled to 0. 5 increments A wide temperature range allows Temp Chex thermometers to be