... ,food, spices, monosodium glutamate 2.Purity measurement WXG-4 Disc Polarimeter Main use: Disc polarimeter is used to measure the proportion, pureness, consistence ... value of dial: 1°3. Reading value of dial nonius: 0.05°4. Zoom multiple of magnifier: 4×5. Wavelength of homochromous photosource ... instrument 8kg9. Overall dimension of instrument 540mm×220mm×380mm WXG-4 Disc Polarimeter