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hpt question

(2 Posts)
user1468173727 Wed 31-Aug-16 15:00:03

Would a hpt (one step) give a result if it has been out of the foil wrapper for at least a week?

physicskate Wed 31-Aug-16 16:33:43

Don't think I would trust it... There is a lot of water vapour in the air that could have already been absorbed by the test...

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