We regularly use both a Qubit 4 fluorometer and the TapeStation 4150 to measure DNA concentrations. We follow the recommended procedures for both devices but the TapeStation consistently gives the concentration as 2-4 times lower than the Qubit. The TapeStation concentration measures 200-5000 bp. Does this base pair range exclude enough DNA to account for the lower concentration? Can we do a standard or QC to ensure that the TapeStation measures correctly?