Vial insert for a spirit level

A spirit level comprising:

• a frame collectively defined by top and bottom portions, back and front portions, and opposing side portions, said frame further defining at least one aperture therethrough;
• and
• a pre-calibrated vial insert disposed inside said at least one aperture;
• said pre-calibrated vial insert including a housing, said housing defining a chamber with at least one vial containing a liquid having a bubble therein, said at least one vial being disposed inside said chamber and attached to said housing such that said pre-calibrated vial insert is calibrated to show true level prior to insertion into said at least one aperture of said frame, said at least one vial including a marking for indicating true level.

In combination, an easily removable pre-calibrated vial insert and a frame comprising:

• the frame collectively defined by top and bottom portions, back and front portions, and opposing side portions, said frame further defining at least one aperture therethrough, wherein said at least one aperture is designed for receiving the pre-calibrated vial insert;
• and
• the pre-calibrated vial insert being disposed said at least one aperture for receiving the pre-calibrated vial insert, the pre-calibrated vial insert including a housing, said housing further defining a chamber;
• at least one vial containing a liquid having a bubble therein, said at least one vial being disposed inside said chamber and attached to said housing such that the pre-calibrated vial insert is calibrated to show true level prior to insertion into said one aperture for receiving the pre-calibrated vial insert, said at least one vial including a marking for indicating true level.

A pre-calibrated vial insert comprising;

• a housing defining a chamber;
• at least one vial containing a liquid, said at least one vial being disposed inside said chamber and attached to said housing;
• said at least one vial each containing a bubble in said liquid and a marking on said vial for indicating true level when said bubble is located between said markings;
• wherein said vial insert is calibrated such that said bubble is located between said markings when said vial insert is placed on a true level surface.