Plumb Site is a proprietary improvement, and a trademark under that spelling, for a spirit level with a viewing mirror to make it easier to use when setting verticals.
A plumb sight is a mirror inside a spirit level that allows the user to view the plumb vial from the front, as well as from the traditional side view, when performing a vertical leveling operation. The user no longer has to squeeze against a wall to see the bubble from the side, but can stand in front of the level and see its reflected image.
Although the use of this sight may be novel for levels, the idea of using a mirror to sight a spirit level bubble from a more convenient position has long been used with surveyor's telescopic dumpy levels.
As well as improving ease of use, a plumb sight may also reduce parallax errors. By using a sight that always views the bubble from the ideal location, risk of reading errors is reduced.
Plumb Site was invented in 1997, and is a feature across Kapro's range of spirit levels.
Famous quotes containing the words plumb and/or site:
“And now the winter sea:
Within her hollow rind
What sleek facility
Of sea-conceited scop
To plumb the nether mind!”
—Allen Tate (1899–1979)
“The site of the true bottomless financial pit is the toy store. It’s amazing how much a few pieces of plastic and paper will sell for if the purchasers are parents or grandparent, especially when the manufacturers claim their product improves a child’s intellectual or physical development.”
—Lawrence Kutner (20th century)