Electrorangefinder

An electrorangefinder was a device that calculated the distance between itself and a target object. These devices were incorporated into electrobinoculars and macrobinoculars and were essential components in the targeting and fire-control computers used by artillery and ship-mounted weapons systems.

Sources

• A Guide to the Star Wars Universe
• The Star Wars Sourcebook
• Galaxy Guide 3: The Empire Strikes Back (As "electro-rangefinder")
• The Movie Trilogy Sourcebook
• Star Wars Sourcebook, Second Edition
• Galaxy Guide 3: The Empire Strikes Back, Second Edition
•  Star Wars Customizable Card Game – Hoth Limited (Card: Electro-Rangefinder) (backup link)
•  Star Wars Customizable Card Game – Hoth Limited (Card: Target The Main Generator) (backup link) (Picture only)
• Star Wars Trilogy Sourcebook, Special Edition
• The New Essential Guide to Weapons and Technology
• The Complete Star Wars Encyclopedia