Usage Tips:Product description Specification: Wort SG: 1.000~1.120, accuracy +/-0.002 Brix: 0~32% ATC range: -20~30C (50~86 F) Dimension: 172x40x40mm Package included: 1 x Beer Refractometer 1 x Calibration screwdriver 1 x Pipette 1 x cleaning cloth 1 x Instruction manual 1.EASY TO OPERATE: This brix refractometer is easy to use, after calibration, put 2 or 3 drops of sample on prism, and towards to light, quick get the precise readings through eyepiece. 2.DUAL SCALES : The brix sg Refractometer with brix scale and specific gravity scale, measuring range brix 0 - 32% (0.2%) and Specific Gravity 1.000 - 1.130 (0.001sg) for non-fermented wort. 3.BEST REPLACEMENT: Accurate brix beer refractometer need less sample solution for Home Brew, brewing , Beer wort making and educational purposes, perfect for replacing your old one or complicated operation hydrometer. 4.AUTOMATIC TEMPERATURE COMPENSATION: Beer wort refractometer With ATC function can automatically compensation according to changes in ambient temperature, more easier and faster obtain readings and take control of the beer brew process. 5.ALUMINUM BODY MATERIAL: The refractometer is made of aluminum and ABS rubber, non-staining, resistant to abrasion and anti-corrosion. Lightweight and portable refractometer easy to carry.