Even if it does (and assuming it says at least 95%) you should still test it using the aquarium test strip method. It seems complicated but it's really not if you just carefully follow the instructions. You can do a search for "SN test strips" and you'll see several posts that explain step-by-step how to do it. Here's one to get started: https://sanctioned-suicide.net/thre...-an-aquarium-testing-kit-rough-version.18188/
A recommended nitrite test strip brand is Bartovation (available through their website and probably also Amazon). It only costs about $20
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