Designed for rapid injection of minute volumes, these microsyringes act by positive displacement. Full syringe capacity is in the needle and is completely ejected when plunger wire is depressed—no void volume. Read volume off PTFE®-coated outer sleeve of syringe barrel. An aluminum spacer controls needle penetration depth to 3/4"; less variance of needle depth results in better reproducibility. All models have removable needles with 90° tips.