The only reason I did not give 5 stars for "Easy to Use" is that a person with weaker hand strength would not be able to get the magnets apart. I'm 69 years old and love this device, but my petite wife cannot use it, but then she can't open twist-off soft drink bottles, either. Warning: Don't get your fingers between the magnets.I got the large size. A weaker person might try a smaller one. It came with both a metal blade and a plastic blade. Even though my tank is glass, the plastic blade works great.
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