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This aperture has thicker walls than a standard aperture tube thus providing longer particle pulses and higher resolution. This Multisizer 4e accessory allows for particles from 1 to 40 microns to be counted and sized. Although aperture tubes are robust, they can become clogged from time to time, depending upon the sample type, and application. This genuine Beckman Coulter replacement aperture will help ensure maximum uptime from your Multisizer 4e and the high quality counts and sizing measurements that you deserve for your Multisizer 4e instrument. Note: This aperture is not compatible with only the Multisizer 4 and 4e.