This product is designed for visual colorimetric analysis in chemical experiments, serving as a key tool for the rough determination of solution concentrations. Constructed from high borosilicate glass with a thickened wall, it offers enhanced durability and resistance to high temperatures, as well as corrosion from acids and alkalis. The transparent glass body and sky glass stopper ensure reliable sealing and clear observation during color comparison. Available in 25 mL, 50 mL, and 100 mL capacities, the tube is commonly used in laboratory settings where simple, cost-effective concentration estimation is required. Its robust material and straightforward design make it a practical choice for routine teaching or research applications in analytical chemistry.