U-Probe, 16-chan w/ 15µm electrode diameter, tetrode; 50µm intertrode, 99µm intratrode spacing; 100mm probe length (31mm; 640µm diameter reinforcement tube); 236µm probe diameter; with a CON/16m-V connector interface; 280µm tip to 1st site, fluid channel at site 5; Imperfect tetrode layout.