... Held Refractometer: 1. For Brix, range: 0-90% with ATC 2. For Salinity: Range: 0-4% (for aquarium), 0-10%, 0 ... foods and beverages. It is also commonly used for controlling the concentration of various industrial fluids (cutting lubricants ... the field, verifying product quality after harvesting, or controlling concentrations during processing and packaging, refractometers provide critical information ...