The Dounce type, glass tissue grinder is supplied with two glass pestles; one with a tight inner tolernace and one with a loose inner tolernace. The loose pestle can be used for initial reduction of the tissue sample and the tight pestle can be used to fine grind the tissue and complete the homogenation.

A precision ground instrument for macerating tissue. Rod and barrel are interchangeable. Rod is ground its entire length and can be reversed for double life. Rod fits Cat. No. 8124-10 Flex-Grip Chuck, forming a flexible coupling to the motor drive when