... measurement probe tube; they have the functions of automatic/manual, constant speed control, fixed points/continuous measurement, automatic depth modification, ... Controller(1) Speed range: 0~30 meter/minute; Automatic/Manual total two controlling modes;(2) Constant speed range: 0. ... .99 meters, error ≤±0.4%;(4) Controlling mode: Automatic, manual, and check;(5) Controlling direction: Up, and down;(6) ...