JSM-IT800 Ultrahigh Resolution Field Emission SEM

The JEOL IT800 Ultrahigh Resolution Field Emission SEM is a a revolutionary FE-SEM with the most advanced high-resolution analytical technology available today. The JEOL IT800 series offers the next level of analytical intelligence for high spatial resolution imaging and analysis at the nanoscale.

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Why do they discontiued so many FESEM models, with just IT800 ?: There were 7600, 7800, 7900 series.