You can still check your thermometer. Boil some water and see what temp it reaches a full rolling boil on your thermometer.
It's hard and some even say impossible to make syrup with just a thermometer. Many people use a hydrometer instead because it's easier to know exactly when it's syrup. If you're going to use only a thermometer you have to at least know what temp water boils at on the thermometer you're using at the time you're making syrup.













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