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First, we need to distinguish between the three types of manuals Hitachi produced for the U-2800, because most users searching for a "user manual" actually need something else.

Sellers occasionally include a scanned PDF of the manual in the listing’s photo gallery. You can download the image without buying the item.

The U-2800 functions as a UV-Visible spectrophotometer, typically covering a wavelength range from 190 nm to 900 nm