CIRCUTOR CPM (Available until stocks) - Manual (Page 15)

--------- MULTIMETER CURRENT CLAMP CPM -------- PG No. 14
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3.2.- Use
ATTENTION
When the value to be measured is unknown always place the rotary switch to the
highest range and reduce it progressively in function of the value in question.
3.2.1.- Voltage measurement
1. Connect the red test probe to the "V" terminal [3] and the
black test probe to "COM" terminal [4].
2. Set the rotary switch [1] to the appropriate "V" position
(AC or DC and suitable range). If the size of the voltage
to be measured is unknown, set the switch to the highest range and then
start reducing it until the highest accuracy is obtained.
3. Connect the test probes to the points to be measured and read the display.
For DC voltages, the "-" sign indicates a negative polarity.