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        Ease of spectrometer operation

        Ease of spectrometer operation is understood to mean:

        a) Spectrometer hardware maintenance:

        a1 Recalibration intervals

        a2 Electrode cleaning frequency

        a3 Stand cleaning frequency

        a4 Entrance lens or window cleaning frequency

        b) Comfort

        b1 Spectrometer operation while standing or sitting

        b2 Arrangement of controls

        b3 Adjustability of operating parameters

        c) Software convenience


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