Ade Advanced Optics Brix Refractometer with compact design ideal for field or lab. Sturdy design, made of durable machined Aluminum. This refractometer has automatic temperature compensation and has 0-55% Brix Scale that is accurate to +/- 0.10%. Comes with a 1 Year manufacturer warranty through Ade Advanced Optics. Place a couple drops of samples on the scale and read the results in Brix through the shaded area on the eyepiece.