The EMI fiberTOOLS consist of the 560XL-EMI (Optical Power Meter), 570XL-EMI (LED Source), and 580XL-EMI (Dual Laser Source). The optical and mechanical performance is equivalent to the non-EMI versions and can be used to measure absolute optical power and perform loss testing on singlemode and multimode fiber links. The EMI designation allows the capability of performing these measurements in harsh EMI conditions to MIL-STD-461E. The 570XL-AS100-EMI meets the stringent AS-100 launch condition.