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What an IP65 IP67 handheld terminal rating certifies: the still-water assumptions behind IEC 60529, the missing drop-test conditions, MIL-STD-810.
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Fixed mount barcode scanner or handheld reader, compared honestly: labour arithmetic, read physics, presentation mode, ergonomics and the infrastructure.
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Receipt printer not printing? Work this support-tech flow: self-test branch, lamp states, thermal paper side, jams, USB, IP, Bluetooth, spooler.
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