SYBONRefractometer with Automatic Temperature Compensation

Works perfectly and easily allows me to verify and track my salinity. Takes a few seconds.

This is the best refractometer for the money. Unlike cheaper ones, it will hold calibration a month or more. Worth every penny.

Excellent tool for keeping my QT tanks and Reef Tanks at the right Salinity. Very quick easy and as accurate as you can get

Throw away your plastic hydrometer. This instrument is well built and accurate. Came with detailed usage instructions and a durable carrying case

Works great! I haven't tried another brand as comparison, however I have not come across and issues.

Very easy to read and feels more solid than the cheaper refractometer I replaced. So far the calibration is holding perfectly between uses.