If you have a marine aquarium, this product is essential to ensure your salinity is always at the correct level. Since my tanks have been set up for some time now, I usually check the salinity when I change the water or once a month. Some people choose gauges to hold in the aquarium water themselves, but from experience and reading the experiences of others, this is the way to go. It may take an extra minute to get a reading, but you will always be assured of an accurate assessment of what is happening in your aquarium. Adjustments as needed before retesting. If you are unsure about this brand or model, let me assure you that it does what it is supposed to do and you will be happy with your purchase!
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