The 700 series is the original Hamilton syringe. This series of Microliter syringes are designed to solve the general liquid handling requirements of manufacturing and research laboratories and remain the industry standard. The plungers and barrels are not interchangeable or replaceable. Recommended Use: The 700 series is used for manual and automated GC and HPLC injections. Also, it is used for everyday applications that require accurate measuring and dispensing of liquid. Volumes: 5 µL, 10 µL, 25 µL, 50 µL, 100 µL, 250 µL, and 500 µL