  We present a new design for a confocal rheoscope that enables uniform
uniaxial or biaxial shear. The design consists of two precisely-positioned
parallel plates with a gap that can be adjusted down to 2$\pm$0.1 \mu m,
allowing for the exploration of confinement effects. By using our shear cell in
conjunction with a biaxial force measurement device and a high-speed confocal
microscope, we are able to measure the real-time biaxial stress while
simultaneously imaging the material 3D structure. We illustrate the importance
of the instrument capabilities by discussing the applications of this
instrument in current and future research topics in colloidal suspensions.
