Abstract: A load weighing device for cranes comprises a dynamometer whose output is modified according to the direction of rope motion therethrough. Also described is a safe load indicator for generating a signal representative of the maximum safe load which the crane can carry, which signal is compared with the output signal of the dynamometer to provide an indication when the maximum safe load is exceeded. Further described is a device for sensing the orientation of the crane and for modifying the relation between the dynamometer and safe load indicator output signals in accordance with the direction and degree of slope of the crane during use.