Address P.O. Box 219 Batavia, IL 60510
Phone 800-452-1261
Fax 866-452-1436

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.