Get a digital readout cuff. Most pharmacies have calcium carbonate preparations. Calcium citrate is slightly better absorbed, but costs more. Daily requirements are 1000-1500 mg. Don't try to stay on any program all the time.
Life is too short.
Eighty to ninety percent of the time is ideal. FAA medical standards. The new FAA hearing standards. Values at six feet or better. Speech discrimination means that you can distinguish between words that sound alike, such as bear, tear, wear, here, there, hair, and so on.