Ensure a clear vapor diffusion path

The 1/8 in McMaster-Carr® PTFE beads included with a SC-1 Leaf Porometer hold the Teflon filter in place during measurements without interfering with the water vapor diffusion from the leaf to the two sensors. As part of routine sensor head cleaning, you may notice the beads deteriorating over time. Ordering replacements from METER ensures you get the exact size necessary for the SC-1.