【Standard Parameters】 Measuring range: 0–25% concentration; Refractive index: 1.3330–1.4200; Storage temperature: 0–40℃; Resolution: 0.01% concentration / 0.0001 RI; Size: 121×58×35 mm 【Precision Testing】 Built-in temperature sensor ensures ATC, providing accurate readings regardless of sample temperature. Perfect for coffee brewing, training, and professional evaluation 【10x Continuous Testing】 Hold the READ button for 3 seconds to perform 10 consecutive measurements. The device automatically displays the average (AVER) for higher accuracy 【Color Backlight Display】 HD color screen with backlight ensures clear readings even in low-light environments, making results easy to see at a glance 【Simple One-Key Operation】 Add a few drops of coffee to the metal sample slot and press READ. Results are displayed in under 3 seconds, making testing fast and effortless