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.
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