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Which thermometers are accurate?
Despite advances in technology, mercury-possessors retain the championship in precision measurement.
An infrared protractor can be wrong by 3-5 degrees, while an electronic protractor can be wrong by 1-3 degrees.
Accurate measurement is important because in some cases even one degree is important. But mercury-based grads are dangerous. Because of this, it requires special attention.
The rest is pure marketing nonsense.