The present invention relates to a portable blood glucose meter, which analyzes a temperature change pattern during a reference time measured by a temperature sensor mounted inside a case, predicts and calculates a balance temperature in a current measurement environment, It is possible to improve the accuracy and reliability of the blood glucose level result, and in particular, to improve the accuracy and reliability of the blood glucose level measurement result until the temperature in the case interior space equals the temperature of the indoor environment It provides a portable blood glucose meter that is easy to use because it can measure blood glucose levels immediately without having to wait for a considerable amount of time.
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