Tower Crane's Load Moment Indicator: CXT/20D is suitable for any brand name and all kinds of luffing cranes. Fixed on the tower crane's cabin, it Displays rated load, actual load, the hook amplitude, the hook height, the luffing angle and the moment percentage with black box which can records 5,000 times of work condition. If the load reaches 90% of the crane rating or the specified moment, it will give an early warning. If it reaches 105%, it will alarm and stop the trolley automatically from moving outward and the hoist from lifting upward.