Non-Toxic, Non-Hazardous & Biodegradable. Enviro-Safe® thermometers replace mercury thermometers and give you the same accuracy without any hazards. Market leading Enviro-Safe® liquid is 100% non-toxic, non-hazardous, and biodegradable. Enviro-Safe® thermometers are also made from lead free glass. Statement of Accuracy indicating accuracy traceable to NIST and DKD included. Range: -5 to 50°C. Division & Accuracy: 0.5°C. HB#: 20570. Capitol #: T4264-2.