The printing on the front telling you what the readings are- falls off. This is obviously a bummer. I hope the company offers printed clear labels to fix them! I've had mine for about 3 years and nearly half of the printing is gone.The shell might be polycarbonate. A strong but brittle plastic, if that makes sense. IOW if you don't bang it around or leave it in the sun it'll last a long long time.The only Difficulty in using it is that bubbles sometimes like to stick to the disk, thereby increasing its buoyancy and reading. If you get a peculiarly high reading. retest that cell and tap the unit until the bubbles release. I hope the company has a chemist who can recommend a suitable hydrophilic coating for the disk to prevent such adherence.It is lacking, but by looking at the reviews, all the options are lacking. If your digits have not peeled yet I'd give them a coat of something clear, but nothing that should make them peel up. Maybe place a piece of packaging tape over the numbers. Be aware tho that if you ever remove that tape, you'll be left with a clear gizmo looking for a new use. Perhaps a thin coating of Elmer's glue? I don't know, and my numbers are too far gone to experiment. I'll need to hash in some lines with a Sharpie soon so I have something, anything, to go by.
Rating:
[4 of 5 Stars!]