This item is a professional colorimetric tube. Solid glass cover design, for more stable placement without leaking. The clear white scale can help you measure more accurately. Widely used in schools, factories, scientific laboratories and other fields. Features - Color: Transparent. - Material: Glass. - Size: 3.00X3.00X13.00cm/1.18X1.18X5.11 inch. - Capacity: 50ml. - Made of solid thick glass and have a good feeling. Reusable and solid quality, not easily broken. - Colorimetric tube have clear and accurate scales for you to measure liquid efficiently. - Although it is similar to ordinary test tubes, it has one more accurate graduation line than ordinary test tubes. - Suitable for beginners or professional use, also the students, convenient classroom experiment tools. - Smooth body of the bottle, high transparency, easy to observe, round body of the bottle, stable placement. Package list: 2 x Colorimetric Tube