If you have a glass thermometer it has mercury inside of it. This is the older way of making thermometers and most people aren’t using them any more. People have moved to using digital thermometers that use infrared technology and give you and instant read. These are the ear thermometers. Ther newest technology is infrared thermometers that can be held up to the temple.
There are also non-mercury thermometers that contain non-toxic isoamyl benzoate and dye. Some thermometers also contain pentane or xylene and dye. These thermometers are non-toxic and environmentally friendly but are not always as accurate when reaching very high temperatures.
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