Best way to test nitrogen?

[Mickali]

What do you use to test for Nitrogen? I am trying to find which one to purchase!

 

[beaslbob]

Nitrogen is in ammonia, nitrite, nitrates, and nitrogen gas.

can you be more specific?

 

[saltyfilmfolks]

You’ll want an no3 tear kit. It’s the form most use.

Api salifert and Hanna and Red Sea are the most common test kits. Precision and low end ranges are the basic price point difference. Api being the cheapest and least accurate.
“Best” is generally opinion.
IMO , unless you are really growng high end stuff or just demand that type of precision , any will do.