Unprocessed polymer material in the nature of beads, micro-beads, test beads, quality control beads, counting beads, optimization beads, compensation beads, capture beads, and compensation capture beads for use in calibrating and assuring quality in the operation of sorting flow cytometers or cell sorters, but not spectrometers, for medical, scientific, laboratory, or research use; organically dyed polystyrene beads for use in calibrating and assuring quality in the operation of sorting flow...

Scientific measuring devices, namely, spectrometers