Prokit's Industries MT-1820 - Manual (Page 7)

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gets into the MAX mode, the measuring maximum value will be
held at this mode; Press the button again to get into the MIN
mode, the measuring minimum value will be held at this mode. At
the MAX/MIN mode, the maximum or minimum value will be held
on LCD. Under this circumstance, there are no Bar Graph and
Auto Power Off function, hold pressing MAX/MIN button for 2
seconds, exit the MAX/MIN mode.
7. SELECT: function switch, press the button to switch the
measuring function.
8. RS232/REL: Relative Value Measurement, press the button to
the mode of Relative Value Measurement, press again to cancel
the Relative Value Measurement. Keep pressing the button more
than 2 seconds to switch to RS232 symbol appears on LCD, it
indicates the instrument is getting into the status of data
transmission. Keeping pressing the button more than 2 seconds,
RS232 symbol disappears, the data transmission is stopped.
9. Function/range selection knob: select the measuring function
and range.
10. 10A current input terminal: Measuring AC/DC 10A positive input
terminal, insert red test lead.
11. mA input terminal: Measuring AC/DC uA/mA and Temperature
positive input terminal. The hFE input terminal.
12. COM input terminal: Temperature negative input terminal,and
hFE input terminal, insert the black test lead.
13. input terminal: measure Voltage, Frequency/Duty Circle,
Resistance, Capacitance, Diode and Continuity positive input
terminal, insert the red test lead