This potassium hydroxide refractometer is a water-resistant device and determines the percentage of potassium hydroxide in the water with a measurement range of 0 to 21 %. You can visualize the measurement value and temperature of the sample on the LCD screen. The potassium hydroxide refractometer can measure different parameters, such as potassium hydroxide content and refractive index, quickly and accurately with only four or five drops of the sample.