If you need to drill through wall, out the other side exactly in the right place — use…a compass.
Of course, in collaboration with the magnet, which should be put behind the wall just at the desired point: it will show the compass needle.
Recommend to read
“ELECTROMURES”
The name given to the original device, designed to replace manual labor when laying trunk cables with a diameter up to 60 mm. With their heavy lashes, as if boatmen twine could handle,...
A SIEVE WILL HELP
From time immemorial came to us GRID (as defined by the famous Russian language dictionary by V. dal — "all non-continuous thing with skvoznoy, allowing spans") and a SIEVE ("drum...
