Liquid dispensing device that attaches directly to the mouth of reagent bottles and containers. Used in quality control and R&D departments of manufacturing industries for precise dispensing of reagents and standard solutions. Enables dispensing of set volumes simply by tilting the bottle, allowing continuous dispensing from large-capacity reagent bottles unlike pipettes. Demonstrates effectiveness in reagent preparation and standard solution dilution for chemical analysis, material testing, and quality inspection. Features volume adjustment capability for precision dispensing in the range of 0.1ml to 50ml. Made from chemical-resistant materials compatible with acids, alkalis, and organic solvents. Distinguished by bottle-direct connection structure unlike automatic pipettes or titration devices, this specialized dispensing equipment prevents reagent contamination and improves work efficiency.