Why not any other wavelength?
This was already discussed few times in RG, you may find the answer from the links below:
https://www.researchgate.net/post/Bacterial_density_at_other_wavelengths_besides_OD6001
https://www.researchgate.net/post/Why_do_we_select_600_nm_to_take_OD_at_for_bacterial_growth_measurement_not_other_wavelengths_nm
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