This Refractometer can replace your hydrometer for easier and more accurate measurements. Simply use the dropper to take a sample of wort and put it on the prism. Then hold the Refractometer up to the light and look through the eyepiece. Due to the dual scale there is no needing convert to specific gravity as the scale measures both Brix and SG. It is widely applied in measuring soybean milk concentration, sugar manufacturing, food and beverage. It is also suitable for measuring the solutions concentration of ketchup, jam, and honey water and so on. A Refractometer is easier and more accurate than a hydrometer for measuring sugars. Designed to measure the concentration of sugar solutions and non-sugar solutions. From fruit planting to sale, it can help to determine the appropriate harvest period and contribute to classifying the sweetness degree. It can be used to control the concentration of various industrial solution such as cutting fluid, emulsion and detergent. Specifications: Measuring Range: 28-62% Resolution: 0.1% Color: Black & Silver Size: 2 x 18cm Package Size: 22cm x 8cm x 5cm Maintenance: Accurate measurement depends on careful calibration. The prism and sample must be at the same temperature for accurate results. Do not expose the instrument to damp working conditions. And do not immerse the instrument in water. If the instrument becomes foggy, water has entered the body. Call the qualified service technician or contact your dealer. Do not measure abrasive or corrosive chemicals with this instrument. They can damage the prism's coating.