Filter Holder, Ref.

Description

Filter Holder, 305D, Reference Channel

Fits:

• 305D
• 307
• Astoria2 photometer

Replacement filter holder for your Reference Channel–i.e. if yours is cracked, the Allen-wrench screws are lost or no longer work. Please note that the Reference Channel generally uses a 400X Neutral Density Filter or an Interference Filter (in special cases ONLY), so make sure the ND or IF are in the holder prior to use.