Here you can see the correct use of the glass diagnostic scale BG 13, including explanation how to make your personal settings.
source
Manual for glass diagnostic scale BG 13
Rochelle's Threz "R's"
I see Rochelle's Threz "R's" in your future
I see Rochelle's Threz "R's" in your future
Here you can see the correct use of the glass diagnostic scale BG 13, including explanation how to make your personal settings.
source
