Material: Aluminum Measuring Range: 0 ~ 80% Alcohol Minimum Scale: 1% Automatic Alcohol Temperature Compensation: 0 ~ 30℃ Size: Approx. 30 x 40 x 205 mm/1.18 x 1.57 x 8.07 inches Weight: Approx. 840 g Package Included: 1 x Alcohol Refractometer Screwdriver, 1 x 1 x 1 x 1 x Dropper, 1 x 1 x 1 x 1 x 1 x Container : 1. Open the lid. and carefully wipe the prism with a soft cloth.2. Take a few drops of solution to measure, place it on top of the measuring prism, lightly close the cover to prevent air bubbles, and transfer the solution to the prism surface.3. Directly point the cover to light source or bright place, and use the eyepiece to view the field of view.4. Turn the eyepiece and adjust the handle so that the blue white line can be seen clearly.Boundary scales are the concentration of the solution.Note: 1. Please use this device according to the instructions.Please use with caution.Please do not loosen any connection by itself, and prevent violent impacts, collisions and drops.2. Wipe the utensils with a clean soft cloth, do not wash directly with water, avoid surface scratches.3. Store the equipment in a dry, corrosion-free place.4. Properly store parts5. The adjustment range of the eyepiece and handle wheel is within 0.8 inches (2 cm) left and right.6. The new and old model of this product will be sent randomly, please make sure you do not mind before you place an order.