... 2.Precise 3-D Self-Alignment System 3.Feature III BT-800 Auto Circu.& Disper.S laser condenserFactoryTesting ReportSpecificationsSize Range 0 ... locates the focus of the lens and calibrates the background.BT-800 automatic circulating and dispersing system: 600-2500 rpm adjustable ... , materials of chemical and military industry, battery material and more. BT-9300S laser condenser