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

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

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