About us always strive to provide customers with satisfying refractometers and shopping experience. If you have any problem or suggestions about our wine making kit please let us know it and we will provide 7*24 hours technical support and customer service. Packing List 1 x hydrometer refractometer; 1x calibration screwdriver; 1 x pipette; 1 x instruction manual; 1 x cleaning cloth and a free hard case included which make the brix refractometer meter convenient to store or carry around. Main Indicators High accurate wine refractometer: Brix 0-40% & Alcohol 0-25% Vol. The beer brewing kit is ideal for fruit, juice, home brew, agricultural, gardening & educational purposes, sugar content. ATC Design The refractometer adopts automatic temperature compensation technology from 10 to 30 (50F~86F), reading directly, fast, accurate and light weight. Easy to Use Place 2 - 3 drops of liquid sample onto the prism of this hydrometer, then look through the eyepiece to get the reading directly. NO test jars needed, NO measuring or calculating work needed, operating easily brix refractometer, convenient to use and save your time.