Review on Aichose Refractometer for Measuring Sugar Content in Fruit, Honey and Syrup - 0-80% Brix Meter with Automatic Temperature Compensation by Sean Purnomo

And an affordable refractometer that worked great when I was making my first batch of maple syrup. Much more reliable than other methods. I can't comment on the accuracy as I have nothing to compare but my product is perfect. The manual says it's calibrated and I tested it with a sample of distilled water. It's easy to calibrate when it's slightly off, a set screw driver is included and the set screw is under a protective rubber cap which I thought was a nice touch. Just make sure you get the right range for your application.