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The rear panel of the instrument shows Option 700. What does Option 700 mean?

Option 700 is showing on the rear panel of the instrument as the instrument had been previously returned to factory for an upgrade. This option indicates installation and calibration have been performed for this instrument and it covers the cost of tear down, parts, rebuild and finally complete calibration on the upgrade. Option 700 is stated only on the rear panel, but will not be located on the diagnostic info.