Review on 🔬 High-precision AUTOUTLET Refractometer Saltwater Aquarium: Perfect for Seawater, Pool, Tank Testing, Marine Fishkeeping. 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function, Hydrometer Specific Gravity Salinity Meter Kit – Buy Now! by Kevin Mariappan

So I got this because I was growing adult Artemia. I had to make sure the salinity was high enough but not too high due to evaporation. After calibrating it with reverse osmosis, it was incredibly easy to use. You drop a drop of water with a dropper, then put on the valve and look through the eyepiece and you see a blue line up to the number of salted points. If you are in any way interested in farming brine shrimp like me. I really recommend getting this. Water salinity is really important and my culture has been running for over six months now.