Analog Refractometer Brix Range 28 Percent to 62 Percent Brix Automatic Temperature Compensation No Accuracy +/-0.2 Percent Resolution 0.2 Function Determines The Sucrose Level By Measuring The Degree of Which Light Bends As It Passes Through The Sample The Refractive Index Measured is Then Converted to Brix for Easy Reading Features All Metal Housing Calibration Screw Glass Prism Non Roll Stand Rubber Eye Cup Rubber Grip Scale Display Single Hinged Daylight Plate Length 7 1/2 in