V2 Personal Reusable Research Pen Injector - 60 Unit with hole (Brown) - Pen-Depot 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- Cartridges not included. 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.