Nobody "needs" a test kit. Folks have only been hypnotized into thinking that they need these frivolous things by those who sell them. All you have to do is to cycle your tank the proper way. I've been cycling tanks properly since before test kits were even popular, so that's why I know you don't need them. What's worse is that all Nitrogen test kits lie. I would argue that only experienced hobbyists should buy these things because only the people with experience realize how dreadfully deceitful these pieces of rubbish actually are.
Of course, nobody wants to hear all that, and nobody wants to do things the right way. They just want to press a button and have instantaneous microwave success. So they allow themselves to be persuaded that some silly little colored vial knows more that they do, and they surrender all of their power to this sorcery. Do yourself a favor and free your mind.
Cheers,