The REF113 Refractometer is a handheld instrument for measuring the Brix ratio of a substance. Brix is a measure of dissolved solids in a liquid solution and is commonly used to measure sugar content. This device has a scale range of 0 to 32% Brix and is accurate to ±0.2%. It also has automatic temperature compensation between 10 and 30 degrees Celsius. To use it, just put a drop of the sample solution on the prism of the instrument, and the refractometer will display the Brix reading on the scale. This versatile tool is used in various commercial applications, including food and beverage production and laboratories.