Refractometers are used the world-over to monitor sugar concentrations (brix) in foods and beverages. They feature an all-metal body to ensure long life. All daylight plates are hinged with metal pins so that the daylight plate can be easily replaced if it is broken. They have a brix range of 0-32 degrees. This model is equipped with Automatic Temperature Compensation (ATC), which allows for a shift in ambient working temperatures without recalibration. The operating range is 50 degrees Fahrenheit to 86 degrees Fahrenheit. All units are backed by a 1 year warranty.