This unit can be used with the UNEX II (model 2400, above) to provide smooth, uniform isokinetic resistance in two directions of rotation from 0 to 90kg (0 to 200lbs). Offers independent adjustment for both flexion and extension. A visual readout provides instant feedback. Provides a convenient, efficient alternative to metal disc weights. Includes the dual-leg bolster pictured on the UNEX III (model 2403, opposite page). Five year warranty. Weight 16kg.