One of the most important hand tools.
Wood is expensive, the nicer the wood, the greater the
need to have accurate measurements. I have run into many
situations where I would have ran out of wood if I had not
remeasured the stock before I cut it.
Many people forget to include certain things when measuring.
The most important one is the kerf.
Kerf - the thickness
of the blade cutting the wood. Depending on the saw you
use, you need to be aware how much of the wood is going
to be eaten away by the blade