KYORITSU 2009A - Manual (Page 12)

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Data Hold
Resistance
Voltage
Ampere
Low frequency input
DCA auto zero Peak mode Low battery warning
Continuity Check
Negative sign
AC DC
Average mode
When the plug is inserted into the output terminal, Data Hold Switch
operates as range selection switch.（See 7-4 output terminal）
⑤Mode Selector Button
Selects measuring mode. The instrument defaults to the normal
mode (NOR). Then, press this switch to cycle through measuring
modes. In any mode, pressing this switch for more than one second
returns the instrument to the normal mode.
⑥Zero Adjust/Reset Button
Used for zero adjustment on DCA and resistance ranges. Also used
to reset the display reading in the PEAK mode. On DCA range,
"AUTO" is shown on the display when auto-zeroing is completed.
(Auto-zeroing is available on 400A range only.)
⑦Digital Display
Field effect digital display with maximum reading of 3999. Function
symbols and decimal point are controlled by the microprocessor
based on the selected function and measuring mode.