As the HoloLens recognizes hand gestures, you can use the tip of your finger to make marks. However in surgery, delicate hand movements are a daily part of the job and require more accurate measurements.
To achieve the precision of a surgical instrument, there are styluses available for HoloLens with an accuracy of 1-3mm. With the user-friendliness of a pen, it allows you to highly precisely make holographic marks, annotations, or even measurements.
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