What is the red dot on a tape measure?
How do you read a diamond tape measure?
Why is every 16 inches marked on a tape measure?
Tape measures usually have a red mark every 16 inches. This makes it convenient to mark off wall studs or joists, which typically are 16 inches apart. Unless you are dealing with wall studs or joists, you can ignore this marker.
What is the tape measure trick?
What does 5m mean on a tape measure?
What does the black dot on a tape measure mean?
Can a tape measure cut you?
How do you tell how old you are with a tape measure?
Why does the hook on a tape measure move?
Why are tape measures yellow?
Can a tape measure break your finger?
What is the end of a tape measure called?
What is the 8 foot rule?
How many inches is a ruler?
What is the smallest line on a tape measure?
What is the 21ft rule?
What is a carpenter’s rule?
What is the 5 foot rule?
What is the 30 foot rule?
How long does it take for average person to run 21 feet?
At what range is a knife better than a gun?
Essentially, it says that when an assailant wielding a knife is closing in, they will cover 21 feet in the time it takes you to draw and fire your gun.