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Balances are an essential component of any academic science lab. Flinn Scientific has numerous resources in proper use, maintenance tips and care to help extend the use of your balance.
Calibration and zero-points for electronic balances are set during manufacturing. If you see a "uL" error code, then it is likely that the zero-point has shifted or the calibration factor has been lost. This should not be a reoccurring problem, however, it is a good idea to calibrate the balance once a week especially for balances that are used often or have milligram specificity.