Triplett 9007-A - Manual (Page 38)

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7.10.5
If the displayed value is less than “200” (decimal point
not shown), a more accurate reading may be obtained
by setting the RANGE switch to a lower range. Rotate
the RANGE switch to the next lower position and
observe the reading on the LCD display. If the RANGE
switch is already on the lowest position (i.e. 2n F), no
greater measurement resolution can be obtained.
Notes:
a) On the 2nF and 20nF ranges, the meter may indicate residual
capacitance. i.e The meter reading will not go to zero. This is
caused by the internal capacitance of the meter circuitry or the
test leads.
b) The Test Leads may introduce error when used on the low
capacitance ranges (like 2nF and 20nF). To minimize the error,
note the difference in reading with the leads inserted into the
meter and with the leads removed from the meter, and when
using the test leads, subtract the noted difference from the
displayed reading.