... They have functions of automatic/manual, constant speed controlling, fixed point measurement/continuous measurement, and depth. 1 They are special equipments ... ) Controlling direction: Up, and down;(6) Measurement mode: fixed point measurement, and continuous measurement;(7) Working temperature: -10~55 ° ... 50 Hz; JCH-1000 Automatic Constant Speed Controlling Fixed Point Measurement Cable Winding Winch