Adding the clinical framing, because it changes how the question reads. The version of this that has an answer is narrower than the version being asked. Narrow it and it becomes tractable; leave it broad and the thread will produce nine confident and incompatible replies.
VendorMark said:The version of this that has an answer is narrower than the version being asked.
Same pattern here, and in the same order.
VendorMark said:The version of this that has an answer is narrower than the version being asked.
There is a second half to this that has not been said yet. Start from the measurement rather than the conclusion. Almost every disagreement here turns out to be two people measuring different things and comparing the numbers anyway.
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Shop Reference StandardsThe figures, for anyone assembling their own picture. Keep the original post as written when you update it, and add the correction underneath. An edited-away mistake is invisible to the next person who makes it.
A narrower follow-up, since the general answer is now clear:
How long did you give it before you decided it was working?