Lactometer is designed to measure the density of milk (Low-fat, whole, sterilized, protein, high fat), as well as buttermilk and whey. The recommended temperature of the sample is (20 ± 2) С/ 68-71F. To measure the density of milk (buttermilk, whey) put the clean and dry lactometer in a tall container with milk sample (buttermilk, whey) and allow it to float freely without touching the walls of the container.