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【High Capacity Design】The refillable peptide pen is designed with a 60-unit capacity, making it convenient for frequent use. It comes with a protective case, ensuring easy storage and portability. 【Precision Control】This peptide pen is fitted with a smoothly turning adjustment knob and clear visible markings, which allow users to tweak settings across the complete 0‑60 unit range during ordinary operating steps. 【Universal Compatibility】This peptide pen works with most standard 3ml cartridges. It features simple, secure cartridge fitting that helps keep consistent working performance during your day‑to‑day operating sessions. 【Durable Construction】This peptide pen is assembled from sturdy metal components. It maintains a light weight and modern appearance, offering a pleasant hand feel when used over many repeated handling cycles. 【Sealing System Integrity】This reusable peptide pen adopts a purpose‑built sealing framework to reduce exposure between inner liquid and ambient air, lowering outside interference and offering safeguards for internal contents.