The long range plan for Fermilab calls for large proton beam intensities in excess of 2 MW for use in the neutrino program. Measuring the transverse profiles of these high intensity beams is challenging and generally relies on non-invasive techniques. One such technique involves measuring the deflection of a beam of electrons with a trajectory perpendicular to the proton beam. The deflection as a function of impact parameter contains information about the charge profile. A device such as this is already in use at the Spallation Neutron Source at ORNL and a similar device will be installed shortly in the Main Injector. The Main Injector device will be discussed in detail and some test results and simulations will be shown.