This document provides product information for a DNA Logic-Ladder sold by Bio Basic Inc. The DNA Logic-Ladder contains 16 DNA bands ranging from 100 base pairs to 10 kilobases that are formulated so that the amount of DNA in each band correlates logically to its size. This makes it useful for estimating DNA concentration for applications requiring consideration of DNA amount, such as probe labeling or optimizing ligation reactions. The ladder is tested to ensure the bands between 100 bp and 10 kb are distinguishable on a gel and that incubation overnight does not cause visible degradation.