Test kits or strips SN

[Ultimatefighter]

Hello,

Internet is saying me it is impossible to test SN with test kit or strips, it will only show of there is SN, not the purity level. Only laboratorium can check this

Can anyone confirm?
Thanks

 

[tooafraidtodiez]

I believe that's false but i could be wrong. You can approximately test the purity of your SN but not 100% accurate. Still better than not doing it, i used these https://sanctioned-suicide.net/thre...with-aquarium-test-strip-0-1-5-10-ppm.243449/