I have a brackish crab tank and need to maintain a specific salinity range. The pet shop didn't tell me that fiddler crabs can't live in fresh water, although I have no experience with this type of aquarium and had to learn quickly. This meter worked great for me. I followed all the instructions for making it, including purchasing a jug of distilled water for initial cleaning. Before trusting the results to add sea salt to the tank I asked my well service to test it on their equipment and it seemed very wrong. sync with your tester. I add salt to the aquarium very slowly (over several weeks) and check the water after each addition. The results I'm getting show a gradual increase in salinity and SG and the crabs are thriving. worked for my purposes.
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