Carpenters Spirit Level:
Spirit levels feature a slightly curved glass
tube which is incompletely filled with a liquid, usually coloured 'spirit'
(a synonym for ethanol), leaving a bubble in the tube. Ethanol is used
because of its low freezing point, -114°C, which prevents it from freezing
in cold weather. Most commonly spirit levels are employed to indicate how
horizontal (level) or how vertical (plumb) a surface is.
Torpedo Level: Handy in close quarters, sometimes magnetized along
one side. Usually has 2-3 bubble glasses in it at 45 and 90
Laser Level: A laser line level is a tool combining a spirit level and/or
pendulum with a laser to indicate a levelled line against a surface.
Handheld laser line levels are used in surveying, construction and
Plumb Bob: A weight hung from a string used to create a line
perpendicular to the ground.