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Extra Description:1.This optical refractometer is used to measure the sugar concentration of liquid in degrees brix (0-32). 2.It gives you high accuracy and apparent results because of the ATC which increases accuracy and eliminates concerns on temperature. 3.This tool is essentially helpful and easy to use. The user manual will be helpful for teaching you how to use and keep it in good. 4.It is a must if you are addicted in making wine or fruit juice. POINTS: 1.We suggest that you need to open this case and let the refractometer expose to the air indoors for few days the moment you get this product. Therefore, this tool won't have heavy flavor. 2.You should calibrate to "0" scale before your test. The upper portion of the filed should be blue, while the lower portion should be white. 3.You must let the liquid cover the entire surface of the prism without air bubbles or dry spots. 4.Remember to adjust the EYEPIECE when you can't read the results clearly. 5.Clean the instrument between each measurement using a soft, damp cloth. Notice-Maintenance:1.Accurate measurement depends on careful calibration. The prism and sample must be at the same temperature for the accurate results. 2.Don't expose the instrument to damp working conditions or immerse it into water. 3.Don't measure abrasive or corrosive chemicals. They can damage the prism's coating. With care, this instrument will provide years of reliable service. Warranty: 1.We provide good and reliable customer service. 2.If you have any questions with our products, contact us at the first time, we will definitely reply you in 24 hours . 3.We offer a 100% money-back guarantee within 60 days.