Instant Ocean Aquarium Hydrometer

I'm using this to measure low salinity in brackish tanks and for salt ich treatments. One thing to remember....the directions say rinse Before and After....BUT when you rinse it in tap water, there are many drops of fresh water still in the instrument...if you dip it in tank water and take a measure, you will get a LOW reading....so dump that first sample after a minute or so...Then dip Another sample and you will have an accurate reading every time. This is a very good hydrometer for the money. Many buy expensive refractometers or resistive types which can also deceive you for a number of reasons.

When kept clean and when you dump the first scoop of water and slowly allow the water to enter so that there are no bubbles on the weighted gauge, and when the water temperature is in the high 70's, the reading is very accurate. I have recently purchased a temperature compensated refractometer from Bulk Reef Supply along with calibration fluid. I compared the readings using this hygrometer and the calibrated refractometer. The readings were identical.

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We are involved in Marine Assessments in the Fiji Islands and we use this little device for on-site testing. Sometimes on the beach, sometimes on boat sometimes in a mangrove. It gives good enough results in the field to see whether furtehr lab testing should be carried out.

A bit fragile for carrying about, but I don't uppose that matters if you're testing a fish tank in your home!

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Works every time but I agree to dump the first test to get rid of the fresh water and do a second test but I would do that with any hydrometer

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Bought this to test the water in my marine aquarium. It's way off! Said the specific gravity was 1.022 when it was actually a extreme low 1.015. Lucky for me it's a new set up and no fish yet or else I'd be out a lot more money for sure. And yes I rinsed very well before and after use.