When measuring the reference SWOP C3 or Fogra39 white paper, position the colorimeter correctly in a desktop viewing booth and in a viewing station.
Desktop viewing booth
Viewing station
Tip: To reduce shadows when measuring the light booth luminance, make sure that the white reference paper is lying flat on the table top surface of the light booth.Then, position the colorimeter at a 45 degree angle to the reference white paper at a distance of 8-10 inches.