Especially if you are using cheap ones. The cheap no-name ones on ebay and amazon weigh 1gram or slightly less than 1g per 100cc of rated oxygen. So even if they are not labeled, you should be able to guess their rating. Still, I recommend testing one per pack in an empty PET bottle, like a 2L soda bottle, wait a week, then measure the volume absorbed by water displacement in a bucket. Note that the rating is probably for sea level air, so for instance in Denver, CO, the oxygen in the same volume container is ~17% lower than sea level. So a 2 liter bottle of air at 21% oxygen has 2000cc x .21 x .83= 348cc of O2.
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