1. Selok® patent technology( Self-locking mechanism for easy locking, provide stable pressure output, backtracking never happened even under high pressure condition; fast and safe release design allows to be performed even by one hand )2. Unique ergonomic design (Apply to both and different shape of hand, perfect adaption hand curve; easy to control even for single finger; For one hand exhaust)3. Precise manometer (Accuracy is higher than the domestic similar products; Luminous dial, visible light; Screw design can support pressure precision adjustment)