I'm not aware of the specific instruments that will take the measurement via camera technology, though I'm sure it exists.
A quick workaround would be to have someone photograph a ruler behind the spikelet. This will tie the size together. At that point you can blow it up on a computer with a reference to get an exact measurement. Do that each direction, and you should be able to get both fairly quickly.
Alternatively, look for Fluke, Keysight or Tektronix to have a camera with measurement analysis in the display.
Image analysis tools would probably useful. Nevertheless, this depends on the sample size needed for the study. An observation approach by human observers would be appropriate at low sample numbers.
counter-question: What is the sample size?
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