Handheld Refractometer with automatic temperature compensation (ATC) is ideal for measurement of refractive index of material under varying temperature conditions during a production process. It offers refractive index scale range of 1.440 to 1.520 ND and 0 to 30˚C Temperature compensation range. The reading resolution is 0.001 ND. The liquid measurement is very easy. Feature satin chrome finish and have rubber-insulated grips, a zero adjusting screw for calibration and eyepiece focusing. Place a few drops of the liquid on the optical part of the refractometer, cover the prism (the liquid will spread more easily over the prism), look through the eyepiece against the light (focus, if necessary) and you will be able to read the result value on the scale.