Step Type:

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Measure both of the distances shown using a long ruler (preferred), or a tape measure. The measurements should be equal to each other, and should be as close as possible to the following:

200x200: 509.3mm

300x300: 650.7mm

400x400: 792.1mm

500x500: 933.5mm

If the measurements are not equal, and are not close to those shown above, double check all corners are square and then check again

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