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Three days ago I have lost my HP 41C with the Petroleum Fluids Pac.
Fortunately I have another HP 41C but my Petroleum fluids Pac is gone. I have used it for nearly 23 years and I can not live witout their units conversions.
Where I can finding it?.
I read in the archives that David Erdman was able to found one recently.
Thaks for your help

The fluids module is a very scarce item. Unless somebody here has one, you will have to diligently scan Ebay every day for around 3-6 months on average before one shows up. I think I have seen three in the last year... and two of them were sold installed in machines.