Factory Direct Sales Eco Friendly Waterproof Adjustable Dose Disposable Medical Injection Pen 60iu Product Description Disposable adjustable dose pen injector, max dose: 0.6ml The dispoable adjustable pen injector only can be used one time. It be used for 3ml cartridge. The syringe is a direct-push mechanical transmission, and the injection is injected by hand with a adjustable dose. Multiple disposable mechanical syringe, the syringe is original mechanical transmission, hand