I don't think this is a correct use of "both". Although it works, like how using a double-negative still gets the message across, I'd like to use an alternative.

  • (1) They have [a] similar quality. (2) Their quality is similar. You can't really use similar with quantity, since that's objectively countable. Jun 29, 2020 at 23:13
  • It might just be more correct to say that the quality or condition is similar for each, or each one. If you are saying any of them out loud you will be understood though you may find a struggle here.
    – Elliot
    Jun 30, 2020 at 1:05
  • Change subject from 'the quality' to whatever it is you're writing about. "The items are of similar quality."
    – stevesliva
    Jun 30, 2020 at 2:26


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