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A Ghost telemetry link that speeds the development of your upgradeable Hand Cannons. Lasts 30 minutes.
― In-game description

Hand Cannon Telemetry is a consumable that increases the experience gained towards hand cannons for 30 minutes.

Prior to Destiny: The Taken King, they could be purchased from Xûr or from dismantling upgraded legendary hand cannons. After The Taken King, they were replaced by Primary Telemetry.