What's STILL in your tool box: CEM Airflow Calibration Tool

Hey, can anyone think of any situation where I would still need a CEM Airflow Calibration Tool in my tool box?  I can really use the space...and I don't believe it has been used in over 10 years. 

Actually, does anyone have a need (including the factory) for such tool?  I'll part with it for the cost of shipping.