Prokit's Industries MT-1620 - Manual (Page 26)

NOTE:
 LED is the main source of back light. Its working
current is large, although the meter has the timer
equipment (time is 5 seconds and it will off
automatically after 5 seconds); often use back light
will shorten the battery life, you’d better not to use
the back light so frequently if it’s not necessary.
 When the battery voltage is less than 7V, it will
show “
”. But if you use back light at the same
time, maybe “ ” will come up even if the battery
voltage is more than 7V, because the working
current is higher and the voltage will decline.
(When “
“ shows, the accuracy of the
measurement can not be assured.) You need not
replace the battery. When you use normally (back
light is not using), “
” will not show up. You need
replace it till “ ”show again.
4.7 AUTO POWER OFF
 If there’s no any operation within fifteen minutes
after power is on, meter will auto power off with five
short sounds and a long sound in a minute.
 After auto power off, if stir the transform switch or
put down any button of “HOLD”
、
“FUNC” 、”RANGE”、”Hz%”、”REL”, meter will
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