Alligator Vertical Tumble Stirrers were set to 100 RPM, microplates were filled with 200 ul of water, deep well blocks were filled with 1.5 ml of water, one stir element was added to each well.  In order to be counted as positive stirring all the stir elements in the plate had to exhibit vertical tumbling or in the case of Stir StiXs back and forth movement. In order to error on the side of under claiming we subtracted 2 microplates (28 mm in stirring height) from each of the totals on microplates and 1 plate (42 mm in stirring height) from each of the totals on the deep well blocks.  These are thus very conservative estimations.

The data shows that the relative position of the plate to magnetic cylinder is important to the height that plates can be stacked and still be stirred.

The deck of VP 710S-2, magnetic cylinder runs directly under positions 1, 2 and 3.