Fringe field effect in cylinder conductivity cell
If the cylinder was infinitely long you would not have any fringe effect. You can change the geometry to make the cylinder arbitrarily long so the fringe effects can be reduced, as with parallel plates you can make the plates arbitrarily large, but the dimensions result in volume and materials increasing proportional to the length for a cylinder and proportional to the square of the plate dimension (square being optimal).  

The guard electrodes would be placed at the ends of the cylinder, such that current virtually only flows radially.