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There are liquid-in-glass thermometers that contain a non-mercury silver substance (Galinstan®) that, according to its maker, is not toxic when swallowed because it passes through the digestive system without effect. Inhalation is also not a concern because there is no absorption through the lungs. Is it a real mercury thermometer?
Mercury is not absorbed through intact skin or from a healthy digestive tract in amounts that would cause toxic effects. Therefore, harmful effects would not be expected from swallowing or touching the small amount of mercury from a broken thermometer.