Help Should I get a "reagent" test too? (SN testing)

[beseechgod]

I went ahead and ordered "aquarium test strips" for testing SN, as is recommended in Vizzy's SN Bible and other guides on the forum.

I've noticed that some people doubt the reliability of of strip tests in accurately measuring SN purity, so I'm wondering if I should get a second kind as well to be certain.

The other kind seems to be "reagent" tests (if I'm not mistaken?), and I've seen people saying that these are more reliable than strip tests.
How would I go about finding/identifying one of these? Any recommendations?

 

[idelttoilfsadness21]

I'm curious and interested myself (:
Hope you get the answe your are looking for