Description: It is for measuring the salinity of salt water quickly and accurately, ideal for agriculture, industry and research application, such as mariculture, fish culture, aquarium, marine survey, water quality monitoring, salt production, manufacture of normal saline, salinity measurement in food processing etc. It can also be used for medical institutions and university research. Feature: 0 to 10% salinity, 0.01% scale . Durable aluminum body, durable and can use for a long time. Adjust the focus by twisting the handle. Compact design with rubber handle. Soft and flexible eyepiece for added comfort . Instant and reliable aqueous solution measurement . Operating procedures: 1. Open the cover and clean the detection prism with a soft cloth. 2. Take the test solution, place it on the detection prism, gently close the cover to avoid air bubbles, and make the solution spread over the prism surface and put the instrument into the light plate. 3. Align the light source or the bright area, observe the field of view through the eyepiece, and turn the eyepiece to adjust the handwheel. 4. Make the blue-white boundary of the field of view clear, and the scale value of the boundary is the concentration of the solution. Speciation: Salinity: 0~10% Study accurately: 0.01% Size: (Dia.) x (H)19 x 4cm / 7.48 x 1.57 inch (appr.) Package Included: 1 x Salinity Refractometer 1 x Cloth 1 x Pipette 1 x Instruction Manual 1 x Mini Screwdriver 1 x Storage Case with Inner Protective Tray Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .