Geratherm Mercury-Free Thermometers

Geratherm is a German manufacturer known for pioneering the mercury-free glass thermometer — a safer answer to the traditional mercury thermometers now banned or restricted in many regions. If you want the reliability and readability of a classic glass instrument without the environmental and health hazards of mercury, this is the line that made it possible.

Our current offering is the Geratherm Oral Thermometer (20010-100), a glass, mercury-free thermometer with an oval shape and dual Fahrenheit/Celsius scale. It uses Geratherm's patented Galinstan liquid metal alloy in place of mercury, so you get the same steady, accurate column reading — no batteries, no beeping, no electronics to fail. The oval body is designed to sit comfortably against the flat surface of a table so it doesn't roll away, and the dual scale means it reads clearly whether your household or clinic works in Fahrenheit or Celsius.

Buyers often ask whether a mercury-free glass thermometer is as accurate as the old mercury type — it is, which is exactly why Galinstan became the accepted substitute. To use it, shake the column down below the lowest marking, place it under the tongue, and leave it in place for about three minutes before reading. Because there's no mercury, a breakage is far safer to clean up, and disposal follows ordinary glass guidelines rather than hazardous-waste rules.

This makes Geratherm a practical choice for clinics phasing out mercury devices, for caregivers who prefer a fuss-free reading over digital gadgets, and for anyone who simply trusts a glass thermometer. Explore the full range of temperature tools in our Thermometers collection, or browse related Diagnostics supplies to round out your kit.