The document describes the Brix refractometer Model ACB-1. It is a handheld, digital refractometer that uses an optical prism to precisely measure the concentration of solutions by their refractive index. The prism is made of metal to quickly conform to sample temperatures. It comes with a carrying pouch and can measure the Brix level of fruits, juices, oils, and other solutions. Refractometers work by comparing the refractive index of a sample to that of the prism to determine concentration.