API Marine Kit
I had being using these products almost 1 year in half without getting a replacement or paying for a another one from chewy.com. This product is very accurate with level of the aquarium. The person that rate this API MARINE KIT product 2 star doesn't know how to use this product properly. I will recommend this product because next text kit very expensive and that redsea products..
This test kit is never accurate, for fresh or saltwater. It's not just the one I got either. I bought a second one from my lfs and it was still inaccurate.