I have a 65 gallon seawater tank and use it to measure salinity. I can only say WOW! I should have gotten this sooner. After a simple no-salt calibration, this accurately reflects the salinity and temperature of my water. This is much better and more reliable than a swing arm hygrometer. I've had it for 4 months now and do weekly water changes. I haven't had to change batteries yet. Thank you to previous reviewers whose advice I based my purchase decision on. This is an amazing addition and you will need a digital refractometer if you are into marine aquariums. Highly recommended.
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