optris CompactPlus Connect Operator's Manual page 73

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CT 73
If the function External Emissivity is selected, the I/O pin is
programmed as analog input. The input can be scaled in the fields
P1 [V], P2 [V], Epsilon P1 and Epsilon P2.
When the Hold Reset Low or Hold Reset High function is selected,
the I/O pin is programmed as digital input. When a Low or High level
is applied, an activated Hold function (MAX, MIN, extended MAX,
extended MIN) is reset.