High Borosilicate Glass Vacuum Bottle: Crafted from premium borosilicate glass, this vacuum bottle features a clear graduated scale for precise volume reading and excellent heat/chemical resistance for long-lasting use Precision Pressure Gauge & Airtight Seal: Equipped with a built-in vacuum pressure gauge and control valve, paired with a secure GL80 threaded cap to maintain consistent vacuum levels for degassing and storage Practical & Stable Design: The wide opening allows easy sample removal and cleaning, while the non-slip base ensures stable placement during vacuum operations Multiple Capacity Options: Available in 250ml, 500ml, and 1000ml sizes, these vacuum glass bottles suit various laboratory, industrial, and home applications Versatile Lab-Grade Performance: Ideal for degassing liquids, storing sensitive samples, and material processing, this vacuum bottle offers reliable, airtight performance for your scientific and industrial tasks