... measurement probe tube; they have the functions of automatic/manual, constant speed control, fixed points/continuous measurement, automatic depth modification, and ... meter/minute; Automatic/Manual total two controlling modes;(2) Constant speed range: 0.5~20 meter/minute, error is ±5 ... supply: AC 220V±10%, 50 Hz; JCH-1000 Automatic Constant Speed Controlling Fixed Point Measurement Cable Winding Winch