Honey Refractometer is an optical precision instrument that determines the density of a liquid by means of the index of refraction. This refractometer is particularly suitable for measuring the sugar content of honey, jam, syrup, etc. The measuring instrument is precise and simple in use: drop a few drops of the liquid onto the prism and the density is directly readable. Easy to Use Please place 2~3 drops of sample on the main prism, close the daylight plate and look through the eyepiece for brix reading.