This handheld optical refractometer measures sugar (Brix) content in fruit juices and beverages from just 2-3 drops of sample, reading out over a 0-32% range with 0.2% accuracy. Built-in automatic temperature compensation keeps readings consistent across a 10-30C working range, and the calibrated prism delivers repeatable results without batteries or power. A carrying case, calibration screwdriver, and cleaning cloth are included for field use.