I have & use the Lee BHN test thingy. Use it & once I figured out how to locate the dimple in the little scope thingy, it works OK., but not what I would like to do often.
I have seen on the internet how some folks use a soda pop bottle & cap to be a microscope stand to read..
Did not try that, so can't give any opinion on it.
I got a microscope type holder to try it, though.
It actually worked pretty well, but not my "thing" to use it. But, it was a good way to do it if yu are Okay with such things & don't have bi-focals & shaky hands.
(
Big hands, Bi-focals...etc. You know... Stuff happens. But it was pretty good to try to use.)
My BEST way of using it is to make just set the die up correctly, make the dimple, highlight it with a red sharpie pen inside the dimple & use a Calipers to measure the indent.
Never failed me yet & I don't have to dink around with anything else.
YMMV< but try it sometime.
Ya might be surprised.
BTW, it is more accurate than ya might thing, if ya set the die up properly.
Your caliper is WAY EASIER TO READ than the little microscope doodad scale.
You can use a different color sharpie pen to highlite the dimple, but I found Red to be the easiest for "ME".
P.S. - IF someone wants the link to the "microscope deal", I can share it for ya if ya want it.