1.Metal body with elegant design, reliable and durable. 2.High precision injection molding screw; stable injection; accuracy error is only 3% 3.Min. Dosage 1u, dosage adjustable from 1u~60u. 4.Safe bi-directional dosage adjustment. Device reset automatically and while injection finishes. 5.Suitable for both injection needles and injection pens, easy to replace. 6.Suitable for 3 ml card bottle potting medicine liquid injection 7.Can be used over 2 years. Easy operation.