Sper Scientific 840073 Multimeter - Auto-Ranging - Manual (Page 29)

9. “Hold”, “Power” Button Function
G. Make Measurements(11)
1) Pressing “Hold” button holds current reading displayed on LCD in
open state, press it again to release the current reading displayed on
LCD.
2) At power on state, press Hold to enter and exit the touch hold mode.
3) At hold mode, it can capture the present reading and display on the
LCD; otherwise, the reading is a random value.
4) The Meter has Auto-power-off function, which switches the Meter off
if it is not used for more than 30 minutes. At this time, press the button
will restart the power.
Hold and power Button are the same one.
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Model UT30A: OPERATING MANUAL