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Thermometer, 20mm

These tiny little thermometers have a range of 0-120 Fahrenheit, which is basically the livable range of humans, so should prove quite useful anytime you have any doubt about what temperature it is, and you're also alive. Available in Celsius AND Fahrenheit!

Their small size (20mm, almost exactly the diameter of a US penny, and 7.5mm thick) allows them to be used in a wide range of scenarios, anything from leaving one on the outside window sill to check the temperature, to craft projects, to attaching one to your watch and feeling like Inspector Gadget.

These are water resistant, but they are not waterproof, so will not stand submersion. Some light sealing with lacquer or wax should do the trick if you're interested in using them underwater for aquarium heat tracking or similar cooling system

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