Sometimes I think during QSO's CW stations just sent "5-9-9" no matter what the reception is -- if they can read it, they send "5-9-9".
It's fairly rare I've heard a CW QSO where they didn't send "5-9-9". I think I've heard "5-7-9" a couple times. Don't recall hearing other numbers, if it's happened, I didn't log it down.....
What I meant was that it was one way. I was on scheduled transmission. And I saw it on my Yaesu 857D screen 5 9 and black convergent lines which meant that it was perfect. They dissect when the frequency is off-line. Did they get my CW, Sir?
On most transceivers the power meter tells you how much power the radio is putting into the antenna. I'm guessing that's how the power meter works on your Yaesu 857D.
It basically tells you whether there is full power going to the antenna. It doesn't tell you whether the other person heard your CW or not.
Whether the other person (to whom you're sending the CW) can hear it or not depends on several things: ionospheric propagation, their own receiver, their antenna, etc.
You could be putting full power with low SWR into a properly tuned antenna, and if propagation is bad, or the person you're sending the CW to has a poor receiver, they still may not hear your transmission.
If they get back to you and give you a signal report, then you know they heard you.
If it's one way only, and they don't come back to you, you can only guess whether they heard you or not. But if the power meter on your radio is showing full power, that is a sign that at least your transceiver and antenna are putting out a full signal.