A plethysmograph was an instrument for measuring variations in the size of an organ. On Jedha, G2-1B7 used one such device to track variations on Saw Gerrera's lung capacity.
- Star Wars: Rogue One: The Ultimate Visual Guide
A plethysmograph was an instrument for measuring variations in the size of an organ. On Jedha, G2-1B7 used one such device to track variations on Saw Gerrera's lung capacity.