Set of 3 V2 Personal Reusable Research Pen Injector - 60 Unit with hole 3 Red Grey Black - Key Features: Precision-Controlled Delivery: Fine-tune each injection with an adjustable dial for 1 to 60 units per release, allowing consistent and controlled administration. Reusable Metal Construction: Built for long-term use with high-quality metal components that resist wear and provide a professional-grade feel. Universal Cartridge Compatibility: Fits ONLY 3ml - 11mm Long Stopper Cartridges. You must self steam cartridge packages. Place unopened, sterile-ready 3mL cartridge packages flat on the rack in a pressure cooker with 1–2 inches of distilled water; do not stack. Close the lid, bring to full pressure (15 psi), then cook for exactly 30 minutes. Turn off heat and let pressure drop naturally (15–30 min). Using tongs, remove packages and cool completely on a clean surface. Keep sealed until ready to fill—sterile inside. Sealed System Integrity: Designed to support compound protection by reducing air exposure and minimizing contamination during research use. Simplified Compound Tracking: Supports easy logging of delivery units and volumes during ongoing compound trials or rotation schedules. Note: THESE PENS ONLY WORK WITH 3ML - 11mm LONG STOPPER CARTRIDGES - IF YOU ARE USING PREFILLED CARTRIDGES PLEASE CHECK SIZE BEFORE ORDERING !! This is not a medical device . Use only in accordance with applicable research guidelines.