Refractometers measure the total soluble (dissolved) solids in an aqueous solution using light refraction method. The Refractive Index of a sample varies depending on its concentration and can be used to convert into many other useful units of measure. A digital Refractometer is highly accurate instrument that removes the subjective nature of traditional optical testers. Manual (optical) refractometers offer uses graduated lines on a scale used to reference the sample fluid, which as seen as a colour change. We stock a wide range of both types available in various scales for Brix (sugar), Refractive Index or hydration (specific gravity) measurement. We are agents and stockists for the world famous Atago brand from Japan, including the popular PAL digital and MASTER optical series.