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The Atago 2691 Master-Milk is a handheld, portable, refractometer that measures the percentage of milk concentration (0.0 to 23.0%) with a refractive index measurement, has automatic temperature compensation (ATC), and is housed in an Ingress-Protection (IP)-65 rated metal body. A milk refractometer measures milk concentration in a refractive index of a milk sample, converts it to concentration in units of percent by weight, and displays the results. Handheld refractometers are commonly used in the culinary, food and beverage, pharmaceutical, educational, geological, chemical, and ecological industries, and for water-testing applications. This refractometer is housed in a durable, die-cast, Ingress-Protection (IP)-65 rated, aluminum metal body for heat and organic solvent resistance, and protection against dust and water jets. The 2691 Master-Milk features automatic temperature compensation (ATC) for immediate, accurate calibration readings, regardless of ambient temperature. Calibration can be controlled and adjusted with an exposed calibration screw and an included specialized screwdriver, although other items can be used to unscrew the unit. However, the unit retains its water-resistance. Ambient light illuminates the scale, and no additional power source is required. The outer shell grip is ridged for gripping, and easy to clean, which reduces the possibility of food and sample entrapment, avoiding contamination and bacterial growth. The analog salinity scale features a bright, high-contrast display for clear visibility of the boundary and memory lines intersection. Samples are viewed through a monocular, focusable, cushioned eyepiece. The unit includes a protective plastic storage case with a foam cut-out insert to cushion the instrument. Specifications Measurement scale range 0.0 to 23.0% milk co