This is the most widely used spirit level, which consists of a metal bar with three vials all containing an air bubble. The vial in the centre of the bar and located on its top edge indicates the horizontal level, while the vials towards the end of the bar indicate the vertical level. On some models, one of the vials at the end of the bar can be adjusted to measure specific angles. Spirit levels range in length from 450mm (1ft 6in) to 1800mm (6ft).
To check the horizontal level of a shelf before fixing it to the wall, hold the shelf against the wall with the level on top of the shelf. Move the shelf until the air bubble in the centre of the bar is exactly between the two marks on the vial. This indicates that the shelf is level and you can mark its position on the wall.
To check whether a fence post is standing vertically before concreting it into position, hold the level against the side of the post. Once again move the post until the air bubble in the top end of the bar is positioned exactly between the lines marked on the vial. This indicates the post is truly vertical.
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