B
Bill
why not just clean them when adhesive gets on the levels?I use a Bosch laser level and the extendable pole, few years old but works fine.
When it comes to spirit levels i just get the drop forge sets when needed when on offer at screwdix, all ways check them for level, and allways get the 90cm level seperately.
They allways get covered in addy and after a while are hard to read.
Buy cheap and often in my opinion.