The Reichert® Glycerin-Chek fahrenheit pocket digital refractometer is a versatile refractometer that raises the bar for performance and value. It's easy to operate and provides quick results. This unit features three measuring scales: % concentration, Freeze Point, and Boiling Point of Glycerine. The temperature scales are displayed in Fahrenheit. Our refractometer can be used to measure the concentration of antifreeze formulation in wet fire sprinkler systems. 10,000 measurements powered by 2-AA batteries provided. The Glycerine-Chek is truly a pocket refractometer with compact dimensions (WxDxL) of 2.1 x 1.1 x 3.9 inches. Supplied with a complimentary detachable neck lanyard and durable storage box.