Abstract: An adjustable batting tee comprising: a base with a lower planar support surface; an outer tube extending from the base, wherein the outer tube includes a hollow core; an inner tube, wherein the inner tube is disposed within the hollow core of the outer tube; and a locking mechanism which locks inner tube relative to the outer tube at one of at least two discrete positions relative to the floor, ground and/or home plate so as to present a ball supporting distal end of the inner tube at one of the discrete heights from the floor, ground and/or home plate. The locking mechanism includes a projection, at least two circularly shaped grooves, and a longitudinal groove in communication with the at least two circularly shaped grooves. A visual indicator is provided to indicate to the user the discrete heights.