The Sniper™ uses the principles of triangular geometry, or trigonometry, to harness the power of a laser beam and measure camber and toe. The lasers pointing across the kart establish a reference plane (straight line) through the two front spindles.

The calculations are based on the fact that the distance between a pair of two correctly mounted Snipers™ should be around 800mm. We also take into account the diameter of the front tire as being the standard 260mm (10 inches). 

Considering that the unit has a realistic resolution of around 0.25mm, even if the distances above vary on your kart by 10 percent, your readings will only vary 0.025mm (25 Microns) from the actual. 

By using the distance between two mounted units, and the diameter of the front tire, a triangle is formed. By using the laws of trigonometry we can then solve the angle formed by this triangle. We then translate this angle into a distance moved by the laser beam. This is what is represented by the visual grid system on the face of each unit.

The laser beam shines out from the center of one grid at the opposing unit's grid system. Therefore, if you have both lasers shining directly at each other, you have a reading of zero camber and zero toe. The two units are kept in alignment to each other by a precision spirit level vial mounted into a recess on top of each unit.
Each horizontal line on the grid represents 2mm camber per side and each vertical line represents 2mm toe per side.

Therefore with both units showing the above reading, the kart would have zero toe and 4mm total positive camber (2mm per side).

With both units showing the above reading, the kart would have 2mm total toe out (1mm per side) and 6mm combined positive camber (3mm per side).

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