Designed to measure the refractive index of a solution Only 2 to 3 sample drops are required for a reading in 2 to 3 seconds Calibrate with distilled or tap water p> Can be cleaned under running water IP65 water resistant. Product This is a professional optical instrument which employs the measurement of refractive index to determine the percent Brix of sugar in aqueous solutions. The digital refractometer eliminates the uncertainty points associated with mechanical refractometers. Occasion: This refractometer can commonly use in lab, industry or school teaching. It supports for measuring the sugar content of Brix, Sugar, Juice, cutting fluid, etc. Technical Data: 1. Measuring Range: Brix 0.0 ~ 53.0%; Temp. 10 ~ 100C / (50 ~ 212F) 2. Division: Brix: 0.1%; Temp.: 0.1C 3. Accuracy: Brix: +-0.2%; Temp.:+-1C 4.Working Temp.: 10 ~ 40C / 50 ~104F 5. Sample Quantity: 0.3ml 6. Measurement time: about 3s 7. Power: 2 x AAA battery 8. Size: 130 x 55 x 25mm (5.2 x 2.2 x1inch) 9. Weight: 100g / 3.53oz