  There are only two methods for estimating the mass distribution in the outer
regions of galaxy clusters, where virial equilibrium does not hold: weak
gravitational lensing and identification of caustics in redshift space. For the
first time, we apply both methods to three clusters: A2390, MS1358 and Cl 0024.
The two measures are in remarkably good agreement out to ~2 Mpc/h from the
cluster centers. This result demonstrates that the caustic technique is a
valuable complement to weak lensing. With a few tens of redshifts per (Mpc/h)^2
within the cluster, the caustic method is applicable for any z<~0.5.
