U.S. Standard Sieve Series Stack – Humboldt, Precision Scientific & W.S. Tyler For Sale

This listing features a set of vintage laboratory test sieves from the U.S. Standard Sieve Series, manufactured by Humboldt MFG Co. (Chicago), Precision Scientific (Chicago), and W.S. Tyler Co. (Cleveland, OH). These brass and bronze sieves were used for particle size analysis in engineering, geology, and materials testing. Each sieve includes its original engraved metal label with mesh specifications in millimeters, inches, and microns.