Shrimp need a cycled and matured tank. Wait until the tank has shown 0 ammonia and nitrites for at least two months before adding shrimp. If you add them now, they will die, as they are extremely sensitive to ammonia and nitrites and do not belong in a cycling tank.
Your tank is not properly cycled, and now you'll have to fish-in-cycle. This is doable, you just need to carefully monitor parameters and do water changes as needed. Please read up on the nitrogen cycle. I'll provide some links at the end of this post. Make sure to be diligent in your testing and water changes.
You could sell the second test kit or send it back to Amazon, if possible. I doubt you'd need two, they last for years.
Aquarium Nitrogen Cycle (The Complete How-To Guide) - Fishkeeping Advice
Fish-in Cycling: Step over into the dark side - Aquarium Advice