A refractometer is used to measure the density of a solution or to take a Brix reading in wine making or beer brewing. This refractometer features a Brix scale only. Luckily Brix are easily converted to the gravity scale by simply multiplying by four! (This will get you close enough at least!) For Wine: Measure the brix level (sugar level) in your grapes with just one drop! The perfect vineyard tool for monitoring ripening grapes. We also use them after the crush to get an exact brix reading. They cannot be used after fermentation, without using our special calculator, because alcohol distorts the reading. For Beer Making: A refractometer allows you take instant Brix readings at any point during the boil, or even during the run off of the sparge during an all-grain brew. These 'during the process' readings allow you to add more water or boil longer so you can attain exactly the gravity you desire. Refractometers measure in degrees brix, which are nearly equivalent to balling or plato, which is how many breweries measure wort gravity. Our Refractometer: We have been a direct importer of refractometers for ten years. Early on we purchased from several manufacturers before we settled on the current supplier. We are confident in the quality and we back that up with a one year warranty. Refractometer Statistics: Our refractometer is hand held with a metal body, flexible eye piece and rubber grip. It features a 0 to 32% Brix scale with .2% resolution and ATC (Automatic Temperature Compensation). Traditional refractometers without ATC are calibrated to work at 68 degrees Fahrenheit. The ATC function allows you to use the refractometer in an ambient temperature range of 50-86 degrees Fahrenheit (10-30 Celsius.) Because your sample is just one drop, and will quickly adjust to the temperature of the refractometer, the temperature of the sample is irrelevant. Our unit also comes with a manual calibration knob that is secured with a lock nut. To calibrate place one drop of water on the testing platform and adjust to zero if necessary. Please Note: This refractometer is brix only!