CHEMetrics generally accepts returns of resellable merchandise for credit when such merchandise is returned within 60 days. Products with a shelf-life of less than 1 year may need to be returned within 30 days to be considered "resellable" and receive credit. Customers who wish to return merchandise should call CHEMetrics in advance to obtain authorization. Restocking fees of 20% may be imposed except on instruments returned within 30 days of purchase. Additional fees may be imposed for special handling.