Triplett 9007-A - Manual (Page 29)

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7.5 DC Current Measurement:
WARNING!
If the magnitude of the current to be measured is unknown,
always start by setting the meter to the highest range, and then to
lower ranges, until a satisfactory reading is obtained.
Do not rotate the RANGE switch with the input applied to the meter.
If the input current is higher than 10A, do not attempt to measure!
Use caution when measuring current in a circuit with voltages
above 50 VDC. Do not use meter to measure current in circuits
whose voltage exceeds 250V AC/DC.
7.5.1 Connect the black test lead to the COM jack. Connect the
red test lead to the 10A jack unless it is known that the
input current is less than 200mA. If the current is less
than 200mA, connect the red test lead to the uA mA jack.
7.5.2 If the red test lead is inserted into the 10A jack, set
the RANGE switch to the 10 A position.
Connect the test leads IN SERIES with the circuit to
be measured. Read the value of the current on the
LCD display.