Here are the differences:
CountBright Plus Absolute Counting Beads:
Bead Size: 4 µm
Excitation Range: 385 - 810 nm
Emission Range: 385 - 860 nm
CountBright Absolute Counting Beads:
Bead Size: 7 µm
Excitation Range: 350 - 635 nm
Emission Range: 350 - 810 nm
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