I looked on Tropic Marin's site and BRS and couldn't find any reference to how the scale is attached and I can't really tell by looking at it. Darn, now my OCD is kicking in again, LOL.How is the scale affixed to the glass inside the hydrometer? Is it just friction holding in place? The once I used to use when brewing where just rolled paper inside the glass. Don't forget to spin to remove the bubbles.