A concrete finishing apparatus and method for smoothing and flattening partially set-up concrete to a close-tolerance surface includes a movable unit that is movable and supported at a partially set-up concrete surface and at least one rotatable ring finishing member mounted to the movable unit. This IC has several reconfigurable circuits, each having several configurations for several configuration cycles. A supporting member which supports optical components constituting the laser scanning device is fixed and supported by the reinforcing member. The first magnetic connector is configured to seal with the microfluidic chip about a channel opening in the microfluidic chip and provide flow communication between the channel opening and the orifice in the first magnetic connector.