Telatemp’s 4127-TL Refrigerator/Freezer Thermometer with temperature-buffered sensor is the perfect solution for monitoring temperatures in freezers, water baths, heating blocks and incubators. The glycol-filled bottle insulates the sensor from rapid temperature changes when the refrigerator or freezer door is opened. This patented unit fulfills all CDC thermometer and vaccine thermometer requirements. The MIN/MAX feature monitors high/low readings overnight, on weekends, or for any time period providing a significant advantage over current reading-only glass thermometers. The instrument range is -58 to 158°F and -50 to 70°C with a resolution of 1° (F or C) and an accuracy of ±1°C.