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

Sniper Rifle Telemetry is a consumable that increases the experience gained towards sniper rifles for 30 minutes.

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