This semi-automatic lab bottle top dispenser features an adjustable 5-25ml precision sleeve, ideal for accurate liquid dispensing in daily analytical work. Designed with durable materials and reliable construction, it is compatible with scientific research institutes, inspection departments, and various applications requiring precise measurement of solutions, acids, reagents, and biochemical samples. Key Features: - Adjustable volume: 5-25 ml - Accuracy: ±0.7 ml - Minimum graduation: 1 ml - Threaded outlet pipe ensures tight sealing to prevent leakage or ejection of corrosive samples - Compatible with most 500ml (35mm diameter) reagent bottles; GL45 adapter allows use with 1000ml square bottles Usage Instructions: 1. Set the quantitative knob to the desired scale, lift and press down slowly. 2. Use at room temperature; cool freshly prepared acid-base liquids before use. 3. Drain air from suction and outlet pipes before each use for accurate measurement. Applications: Petrochemical, dye, environmental protection, and other industries. Note: Not suitable for hydrofluoric acid or strong bases. Wear protective glasses when handling hazardous samples. Product appearance may vary slightly due to updates; color differences may occur due to lighting and display settings. Measurement tolerance: ±1-3 cm. Package Includes: 1 x Adjustable dosing device (bottle not included).