This N-methyl-2-pirrolidone refractometer is a waterproof device and determines the percentage of N-methyl-2-pirrolidone in water with a measurement range of 0 to 100 %. You can visualize the measurement value and temperature of the sample on the LCD screen. The N-methyl-2-pirrolidone refractometer can measure different parameters, such as the N-methyl-2-pirrolidone content and the refractive index, quickly and accurately with only four or five drops of the sample.