Accurately monitor temperatures in freezers, refrigerators, incubators, ovens, and other environments where stability is required. All Thermometers are filled with Enviro-Safe liquid and supplied with a unbreakable plastic bottle filled with Enviro-Safe liquid or glass beads. The thermometer can be removed from the bottle for recalibration if needed. Use the magnetic or hook-and-loop attachment strip to securely attach the bottle to object such as a metal wall or door. All Enviro-Safe™ glass thermometers contain an environmentally friendly non-mercury liquid that is 100% certified as non-toxic, non-hazardous, and fully biodegradable. In case of breakage the liquid can be cleaned up easily with soap and water. Each thermometer features a green liquid and white back glass. These thermometers also feature recyclable packaging, RoHS compliant, individual serial numbered and have a statement of accuracy.