This dual-scale professional refractometer is specially designed for wine making, supporting 0-40% Brix sugar test and 0-25% alcohol measurement to track grape ripeness and fermentation progress. Equipped with high-clarity optical prism and built-in ATC automatic temperature compensation, it eliminates temperature-caused reading deviation and offers instant accurate data without batteries. Its lightweight ergonomic body with anti-slip grip supports convenient one-hand field sampling in vineyards, wineries and home brew studios. Just drop a little grape juice or wine liquid on the prism to read clear dual scales at a glance. It helps vintners adjust sugar proportions, control fermentation cycles and standardize finished wine quality effectively. The smooth sample tray can be effortlessly wiped clean after each detection. Shockproof, compact and easy to carry, this all-in-one testing device is a must-have quality control tool for grape farmers, commercial winemakers and DIY wine brewing lovers.