A liquid dispensing device comprising: a wash buffer reservoir and at least one reagent reservoir (2,3), each reservoir comprising a reservoir control valve, wherein each reservoir control valve is in electrical communication with an electronic control board; a reaction vessel in fluid communication with the wash buffer reservoir and the at least one reagent reservoir (2,3), wherein the reaction vessel comprises one or more baffles; a waste tray in fluid communication with the reaction vessel; a motorized, off-set asymmetric cam, powered by a geared motor, in physical connection with the reaction vessel, the cam being designed to tilt the reaction vessel from one to four times for every rotation of the motor output and/or the reaction vessel being tethered at one end and positioned to rock up and down at the distal end by interaction with the cam; and a central pump wherein i) the geared motor and central pump are in electric communication with the electronic control board, ii) the flow of fluid from the wash buffer reservoir and/or the at least one reagent reservoir (2,3) to the reaction vessel is controlled with one or more reservoir control valves, and the central pump by the electronic control board; iii) each of the wash buffer reservoirs and at least one reagent reservoir (2,3) comprise a port which is in fluid communication with a first port of the reaction vessel; iv) each of the port of the wash buffer reservoir and the port of the at least one reagent reservoir (2,3) are in fluid communication by tubing with the first port of the reaction vessel; and v) the tubing from the wash buffer reservoir and the tubing from the at least one reagent reservoir (2,3) are in fluid communication with a multi-way connector and the central pump. a wash buffer reservoir and at least one reagent reservoir (2,3), each reservoir comprising a reservoir control valve, wherein each reservoir control valve is in electrical communication with an electronic control board; a reaction vessel in fluid communication with the wash buffer reservoir and the at least one reagent reservoir (2,3), wherein the reaction vessel comprises one or more baffles; a waste tray in fluid communication with the reaction vessel; a motorized, off-set asymmetric cam, powered by a geared motor, in physical connection with the reaction vessel, the cam being designed to tilt the reaction vessel from one to four times for every rotation of the motor output and/or the reaction vessel being tethered at one end and positioned to rock up and down at the distal end by interaction with the cam; and a central pump wherein i) the geared motor and central pump are in electric communication with the electronic control board, ii) the flow of fluid from the wash buffer reservoir and/or the at least one reagent reservoir (2,3) to the reaction vessel is controlled with one or more reservoir control valves, and the central pump by the electronic control board; iii) each of the wash buffer reservoirs and at least one reagent reservoir (2,3) comprise a port which is in fluid communication with a first port of the reaction vessel; iv) each of the port of the wash buffer reservoir and the port of the at least one reagent reservoir (2,3) are in fluid communication by tubing with the first port of the reaction vessel; and v) the tubing from the wash buffer reservoir and the tubing from the at least one reagent reservoir (2,3) are in fluid communication with a multi-way connector and the central pump. i) the geared motor and central pump are in electric communication with the electronic control board, ii) the flow of fluid from the wash buffer reservoir and/or the at least one reagent reservoir (2,3) to the reaction vessel is controlled with one or more reservoir control valves, and the central pump by the electronic control board; iii) each of the wash buffer reservoirs and at least one reagent reservoir (2,3) comprise a port which is in fluid communication with a first port of the reaction vessel; iv) each of the port of the wash buffer reservoir and the port of the at least one reagent reservoir (2,3) are in fluid communication by tubing with the first port of the reaction vessel; and v) the tubing from the wash buffer reservoir and the tubing from the at least one reagent reservoir (2,3) are in fluid communication with a multi-way connector and the central pump.