This is a product of "Sogo Rikagaku Garasu Seisakusho," which unfortunately went bankrupt in March 2025, ending its long history. It was highly regarded in the field of science for its high-quality domestic glassware, and it will be extremely difficult to obtain in the future. Although it is a new, unused item, it is a piece of scientific equipment, so there may be fingerprints from inspection or scratches and dirt from storage. The images are reused.