For almost all HP products, the serial number can be found from one of the following locations.
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A label applied to the product (usually on the underside)
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Laser etching on the surface of the product
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Inside the battery compartment
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A purchase invoice or receipt
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Product packaging or shipping box
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Documentation that came with the product
Use a magnifying glass to find and read the serial number. For small items, such as accessories, the number might not be available from the product exterior and is only available from original product packaging, documentation that came with the product, or the invoice or proof of purchase material.
Supplies and consumables, such as ink or toner cartridges, do not have serial numbers.