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Could you provide us with some advice about the use of the x100 gain range?

The x100 gain is best for use with low concentrations.  For example, a 2ppb concentration of Rhodamine WT will generate in the neighborhood of 1.3V in the x100.  The entire range for the x100 scale is only 0-10ppb.  This gives you 10 times better resolution than the medium scale and 100 times more resolution than the x1 scale.  In the x100 scale, each mV is going to signify an incredibly small change in actual concentration.  Keeping this in mind, it is typical to see micro noise in the x100 gain.