Refractometer

A refractometer is an optical precision instrument that determines the density of a liquid based on its refractive index.
There is no need to recalculate Brix and SG to determine the density of wort or wort. Accurate yet easy to use: just place a few drops of liquid on the prism and the density will be read directly. Automatic Temperature Compensation (ATC) eliminates the need for temperature adjustments.
When measured during or after fermentation, the results must be corrected for alcohol in the liquid using a computer program, website page, or mobile app.
Scale 0-32% Brix, reading 0.2%.
Scale 1,000-1,130 SG, reading 0.001