Use these economical refractometers to take quick and easy measurements. Refractometers feature adjustable focus and a zero adjustment screw for calibration. Each refractometer is calibrated and adjusted to read at 68°>F (20°>C). Models with automatic temperature compensation (ATC) are ideal for applications where the temperatures of your sample vary. Refractometers are made of corrosion-resistant brass and have rubber-insulated grips. Include hard case, calibration screwdriver, and instructions. Brix Refractometers measure soluble solid concentration of sugars, salts, proteins, and more in foods and liquids - ideal for quality control and R&D applications. Use to measure percent Brix of juices, beverages, and other sugar-based liquids. Durable units provide quick and easy measurements