If you are running MS Excel or OpenOffice you can just create a spreadsheet. Here's a page from my blending workbook that I used when I was doing fills from a nitrox bank and then topping with air.
If you happen to have an iPhone, you can use the same approach as a spreadsheet in an app called Go Calc, which has worked well for me.
If you happen to have an iPhone, you can use the same approach as a spreadsheet in an app called Go Calc, which has worked well for me.
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