Grass Pens
Type:
Brand:
Circa
1980s or earlier
About This Item
Grass Pens – attached to the top of the oscillographs and “wrote” EEG waves. Used in any Grass EEG analog machine.
This item is in the collection of
Know something about this item?
If so, we'd love if you shared your knowledge so we can share it with the rest of our visitors.