Easily measure the percentage of butter fat content in your sample with these specialized bottles. The body of each bottle is a reaction chamber, while the graduated neck is a measuring device, with precise and thin calibration lines for superior readability. Use the Babcock bottles for measuring liquids and small samples. The Paley bottles feature a large opening on the side of the body to easily accommodate larger or viscous samples, and includes 3 rubber stoppers. All bottles measure 6½"/165 mm height.