Feature: 1. The measuring range is 0‑28%, and the accuracy is 0.20%. It is easy to read and suitable for measuring the salinity of liquids. 2. Professional salinity measuring instrument, it is a portable precise optical instrument, with focus adjustment wheel, easy to measure. 3. The salinity refractometer uses high‑quality prisms, high‑definition eyepieces, non‑slip rubber sleeves, durable and corrosion‑resistant. 4. It has a wide range of applications and can be used for sampling various different reagents and is easy to operate and use. 5. Small size and portable, suitable for aquariums, ocean monitoring, agriculture, gardening, salty pools, spas, fish‑keeping, etc. Specification: Item Type: Liquor Refractometer Material: Aluminum Alloy Purpose: Reagent Sampling Basic Parameters: Range: 0-28% Accuracy: 0.20% Product Size: Approx. 17.5cm / 6.9in. Package List: 1 x Refractometer1 x Dropper1 x Screwdriver1 x Wipe Cloth1 x Manual Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Be careful and cautious in use, use strictly in accordance with the instructions, do not arbitrarily loosen the connection parts of the instrument, do not fall, bumps, and strictly forbid vibration.4. After use, it is strictly forbidden to directly put it in water for cleaning, and wipe it with a clean soft cloth. For the optical surface, it should not be scratched.5. The instrument should be kept in a dry and non‑corrosive place.6. Avoid the loss of spare parts.