Used condition; may have wear and age related marks. See pics for condition / what’s included / testing conducted. Agilent 5517B Two-Frequency HeNe Laser Head 517uW Photos prove Agilent 5517B laser head, S/N US41119506, rear power label 517uW dated 04/05/02, and internal HeNe tube P/N 05517-68201. Condition: Used industrial surplus item with possible age, storage and cosmetic wear. Untested unless explicitly stated; see photographs for exact condition and included parts. Please match the exact part/model/configuration and photographed connectors/specification to your application before purchase. Includes x1 Two-Frequency HeNe Laser Head as photographed.