Sieve Calibration Standard 300 microns or No.50
Calibration Standard for 200mm (8") Diameter Sieves, NIST Traceable for 300μm (No.50); also suitable for 315μm; 5 bottle set, 2.5g per bottle
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Calibration standards for 3-inch and 100mm diameter sieves are also available. Contact us for a quote.