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To calculate your Global Model Number you can either build your own tool using this formula  or use the GMN Generator Tool .

Structure of the Basic UDI-DI (GMN)

The last two characters of the basic UDI-DI are check characters calculated on the previous characters used. The calculator is specifically for a maximum of 25 characters including the check character pair for the Basic UDI-DI. Use our check character calculator above to calculate the check character pair.