Adjustable depth data buoy

A buoy comprising:

• a floatable support having an upper surface and a lower surface, the upper surface formed from a plurality of outer faces and a central orifice, wherein at least one outer face has a surface shape configured to prevent rolling of the floatable support around a longitudinal axis of the floatable support;
• an outer tube connected to the floatable support, wherein the outer tube is partially positioned in the central orifice, the outer tube comprising:
• an upper portion extending past the floatable support upper surface;
• and
• a lower portion extending past the floatable support lower surface;
• an inner tube telescopingly connected to the outer tube so that a depth of a lower end of the inner tube relative to the floatable support is controllably adjustable, wherein the inner tube comprises a depth-adjustable instrument receiving volume configured to protectably receive a water quality instrument;
• a cap having a top surface positioned above the outer tube upper portion and separated from the outer tube upper portion by a telemetry communication separation distance, controllably connected to the upper portion of the outer tube, wherein the cap is configured to operably connect to a marine beacon and operably connect to a telemetry device, wherein the telemetry device operably connected to the cap has at least a portion of a communication component of the telemetry device that is positioned outside the outer tube upper portion;
• and
• a fastener connected to the lower end of the inner tube and/or the lower portion of the outer tube, wherein the fastener is configured to connect to a mooring line for reliable positioning of the buoy during use.