Customer Care and Help
Why is the boiling point method for calibrating a thermometer often less reliable than the ice-point method?
One method is no more reliable than the other method. The ice-point method is preferred over the boiling point method for reasons of safety and ease of use.
The boiling point method can pose a safety threat. With temperature at 212°F, burns from hot water or steam can occur.
The atmospheric pressure and altitude above sea level changes the boiling point of water 1°F lower for each 550 feet above sea level. That means an establishment located 5,500 feet above sea level, would have to adjust the pointer to 202°F using this method.
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