How important it is to get proper gear. Here's a customer who thought is Salinity was at 1.026, which was at 1.038. He would buy corals, and they would melt away within hours of being in his tank. I told him to send us a water sample and bang, here's his results. Get your self good gear. This mistake cost him a lots of $$$$$$. He had a refractometer he bought online to save some $$. And he told me he calibrate it all the time, still way off. I started Derek's Reef Shop to be able to supply customers with good gear and knowledge. Our goal is to keep you in this hobby. Not selling you junk!! Get yourself setup the proper way and enjoy this hobby. Hanna, Red Sea, Triton and Salifert Test Kits is what we sell!!