Measuring range is 0-28% and accuracy is 0.20%. It is easy to read and suitable for measuring the salinity of liquids. Professional salinity meter, it is a portable precision optical instrument, with focus adjustment dial in focus, easy to measure. Salinity Refractometer uses high quality prisms, high definition eyepieces, non-slip rubber sleeves, durable and corrosion resistant. It has a wide range of applications and can be used to sample various different reagents and is easy to use and operate. Small in size and portable, suitable for aquariums, ocean monitoring, agriculture, gardening, salt pools, spas, fish farming, etc. Feature: 1. The measurement 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 precision 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 to sample various different reagents and is easy to use and operate. 5. Small size and portable, suitable for aquariums, ocean monitoring, agriculture, gardening, salt pools, spas, aquariums, etc. How To Use: 1. Open the cover and carefully wipe the prism with a soft cloth. 2. Take a few drops of the solution to be tested, place it on the prism, close the lid gently to avoid air bubbles and spread the solution on the surface of the prism. 3. Direct the light entrance plate of the instrument to the bright spot of the light source, observe the field of view through the eyepiece, and turn the eyepiece adjustment wheel. 4. Make the blue and white dividing line of the field of vision clear. The scale value of the division li Delivery quantity: 1 piece