Sieve Calibration Standard 250 microns or No.60
Calibration Standard for 200mm (8") Diameter Sieves, NIST Traceable for 250μm (No.60); also suitable for 280μm; 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.