WS-1-SL DIFFUSE REFLECTANCE STD, SPECTRALON. STAN-SSH PN A338-MS-1 SPECULAR REFLECTANCE STANDARD, HIGH REFLECTIVITY. DH-2000-BD DEUTERIUM BULB FOR D2000 AND DH 2000, 210-400 NM, 1000 HRS. DH-2000-BH HALOGEN BULB FOR ALL DH2000S, 360-2500 NM, 900