The H3 electrostaff was a type of heavy electrified melee weapon used during the Cold War

The Cold War Event Cold War (3653BBY - 3642BBY)

and beyond. It had three main modifications.
Like many other models, the H3 was made out of Lightsaber-resistant material, combined with a length of over two meters, the H3 was ideal weapon against force users as it allowed the wielder to strike outside of the reach of a lightsaber, and to deflect any blows that slipped inside their guard.

Modifications
A1
A2
A3