Read it with a volt meter after I did it a couple times, too. A big "0"
Read what with a voltmeter ??
Unless you have a high voltage probe and your meter is capable of reading high voltages I don't recommend doing that ...... unless you don't mind replacing your meter.
Many newer monitor have the bleed off circuit as mentioned already. If it doesn't snap or pop when you discharge then it should be fine. The only thing I would suggest is discharging the anode hole on the tube itself one more time before putting the anode lead back in just to make sure the tube itself didn't build some static charge while sitting with the anode lead off.
And remember..... it's the TUBE that'll get ya, not the anode wire itself.
Seems that everyone fears the big red wire. But it's the tube that is holding the charge.