The Digital Calibration Target Utility Kit from Photovision includes a total of 4 calibration targets (34", 14" & 2x 6" targets) So you'll always have a calibration target that is appropriate to your shooting situation, And since all of the targets have a reflective reverse side, you'll also have an extensive set of reflectors handy to tweak the light quality of your shot. There is also a 34" Sunlight/Soft Silver Slipcover included to turn your 34" target into a fully capable 3-in-1 reflector.
The Neutral 3-Tone Panels of the One Shot Digital Targets allow for custom white balancing, accurate metering and exposure monitoring through the camera's histogram function - all with a single shot. Thereby, vastly improving setup time, and minimizing the need for post correction to your image files. You'll drastically reduce your workflow on the back-end by getting it right on the front-end.