Extreme temperature swings can affect the accuracy of meters and test strips. Avoid stowing your meter and supplies in your car in cold or hot weather, and don't leave your equipment outside in direct sunlight or extreme cold. You must even consider the temperature within your own home.

Because of excessive heat and moisture, the bathroom is also a poor choice for storage, as humidity can affect strip accuracy. Storing your strips inside of your meter case in their original package will ensure that they stay clean.