Fusion Rifle Telemetry
From Destinypedia, the Destiny wiki
When used, it increases experience gained by upgradable Fusion Rifles for 30 minutes. Five Telemetries were able to be purchased from Xûr for one Strange Coin. Additionally, they were able to be gained by dismantling high-level weapons and armor. It was later replaced by Special Telemetry to increase the experience gained for all Special Weapons.
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