Hanna 96811 digital refractometer

 

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The Hanna 96811 digital refractometer (shown in picture) is waterproof, rugged, and only requires a few drops to take a reading and returns results in about 1.5 seconds.

Unlike hydrometers, it includes automatic temperature compensation (ATC) and can be calibrated. You don't have to use calculators or charts to convert the results when taking original gravity readings.

Similar to manual refractometers however, once any alcohol is present (any time after fermentation has started), a calculator such as this one must be used to correctly measure gravity.

Looking for something a bit more portable? The Atago 3810 Digital Hand-Held Pocket Refractometer gets great reviews from brewers. Completely waterproof (it even floats), includes ATC and is simple to use with only two buttons: Take a reading or calibrate.

 

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