This refractometer is design according to the principle that different concentrations liquid have different refractive index ,with quick and accurate characteristics. Automatic temperate compensation, the temperature of the water sample will not effect the reading. Aluminum construction heavy-duty and Light weight, small volume, convenient to carry. Soft silicone handle provides good touching feeling. High definition eyepiece give your a broader view and make your can read more accurately.This refractometer is design according to the principle that different concentrations liquid have different refractive index ,with quick and accurate characteristics. Automatic temperate compensation, the temperature of the water sample will not effect the reading. Aluminum construction heavy-duty and Light weight, small volume, convenient to carry. Soft silicone handle provides good touching feeling. High definition eyepiece give your a broader view and make your can read more accurately. Complete with a soft sponge protective carrying case, a pipette and a mini-screwdriver for easy calibration. Widely used to test Juice,Soybean milk,Milk,wine, beverage, fruit and honey etc. Specifications: Measuring Range : w/w 0-20% Minimum Divisions : w/w 1% Accuracy : +/- 1% Length : 16CM Weight:109G Heavy duty (Durable Aluminum) Package Included:1 x Sweetness Test Refractometer 1 x Pipette 1 x Wipe Cloth 1 x Mini Screwdriver 1 x Protective Carrying Case 1 x Operations Manual Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.