I bought the one on the right a year ago, the one on the left 3 weeks ago.
I always rinsed it out with freshwater multiple times after use, and generally take good care of things
just a reminder to those using them to get them checked out more often than i did (or better yet if you can afford it, spend the extra $35 and get a refractometer), was referenced with 2 salinity refractometers and both showed it was out by .0025. Instead of 1.025 my tank was was at 1.0275 for who knows how long
Happy reefing
