Requires Solid Secondary Standard Cap
 
For Chlorophyll, Rhodamine, Fluorescein, Phycoerythrin and Phycocyanin ONLY. 

Features:
- Can be used in place of a primary liquid standard once a correlation between a primary standard and the solid standard is established. 
- Can be used to check fluorometer stability and/or check for loss in sensitivity. 
- Provides a broad range of very stable fluorescent responses. 
- Has an adjustment screw allowing users to set to a desired signal. 
 
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