If you are out totally, I would use it until the replacement comes.
You have a monitor and can see if it is working, no?
There are travel parameters built into many drugs... since you use a small amount anyway, it probably will still work.
I would still insist on a replacement tho... just in case. But for now it might still be good enough until that happens.
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Weezie looking at petunias 8.25.2017
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