All Milestone rotors feature an enhanced 'vent-and-reseal' technology for controlling the inner pressure of all vessels with complete safety. This patented (US Patent 5,270,010) technology provides the operator with unsurpassed safety and performance capabilities: highest temperature and pressure, highest safety standards and ease of use. While other systems are designed to continuously release pressure during the digestion, the Milestone system is a safety mechanism which releases only the excess pressure from the vessel. The digestion Milestone methods along with the vessel technology ensure complete digestion and avoid any pressure release, which happen if the vessel reaches its pressure limit. This ensures that there is no acid fumes in the cavity and no loss of sample as happens with continuous venting system. The illustration shows 'vent-and-reseal' in action: the vessel cap is held in place by a dedicated pressure release mechanism (1). In the case of over pressure, the mechanism allows the cap to lift up slightly (2) releasing excess pressure, then it reseals again the vessel (3) to complete the digestion process. 'Vent-and-reseal' approach ensures reliable digestion quality, increase the lifetime of the system and the overall safety, avoiding continuos vessels venting, which impacts the reliability of the digestion (loss of elements or sample), the lifetime of the overall systems (corrosion, damages to the vessels components) and the exposure of the operator to acid fumes. While there are other methods of venting, only Milestone has 'vent-and-reseal' technology.