I check the salt, I don’t check the pepper. I use black pepper so I can easily see it on the food.

It is rare that either are used once the food is cooked/served.

I use a one-handed salt & pepper mill.Both have a small light on the bottom so I can see IF the mill is working properly. I can’t hold my hand under it to verify, so I salt by faith…not by sight!!! ;}

If your shakers the ones that you purchase off the shelf at the grocery store are left open , it hardens , so close it and give it a hard shake to break it up and it will work again.
( those are the ones made out of hard cardboard).

Mine are in love.