ER-1A was an ER-1 probe droid built by Graf Zapalo and a team of Naboo engineers. ER-1A was put to work exploring the mysterious ocean tunnels of Naboo.
Sources
The ER-1 Probe Droid: More Secrets of Naboo on Wizards.com (original site is defunct)
ER-1A was an ER-1 probe droid built by Graf Zapalo and a team of Naboo engineers. ER-1A was put to work exploring the mysterious ocean tunnels of Naboo.
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The ER-1 Probe Droid: More Secrets of Naboo on Wizards.com (original site is defunct)