A graduated tube and a finely machined PTFE pestle comprise various styles.

• Graduations are fused into the glass
• 4 mL tubes have a clearance of 0.003 to 0.005" between pestles and tubes
• 10 mL tubes have a clearance of 0.004 to 0.006" between pestles and tubes
• 30 mL tubes have a clearance of 0.005 to 0.007" between pestles and tubes
• 55 mL tubes have a clearance of 0.006 to 0.009" between pestles and tubes

Radial serrations on the lower portion of the pestle deliver the homogenate into the cylindrical portion of the tube.