The Allflex Repeater Syringe offers ultra precision for high volume accuracy. Made with a lightweight metal handle with a non-slip coating for easy grip and comfort. Amber-colored barrel reduces UV sun exposure for a longer life. The repeater syringe has a square plunger rod that produces positive, accurate ratchet action. It also has a positive needle lock. 25 ml adjusts from 0.5 - 2.5 ml in 0.5 ml increments; 50 ml adjusts from 1-5 ml in 1 ml increments.