Using a brewer's Brix refractometer to directly measure ABV of distilled spirit : r/firewater
Abuycs High Proof Alcohol Refractometer, ATC Alcohol Refractometer with 0-80% Alcohol Measurement Range for Liquor and Spirits. High Accuracy ±1% Alcohol Refractometer for Whiskey, Brandy, Vodka, etc. : Amazon.co.uk: Home & Kitchen
A refractometer for measuring alcohol concentration symbol:405573
HOME BREWING 101: Hydrometer vs Refractometer - YouTube
ATC ALCOHOL REFRACTOMETER Measures Alcohol Content Like a Proof Hydrometer - Hobby Homebrew
Digital Refractometers: MA884
A refractometer for measuring alcohol concentration symbol:405573
Alcohol Measurement by Refractometer and Hydrometer