Battery OK, measurements are possible.
Battery Low, battery needs to be replaced,
measurements are still possible.
Battery exhausted, the battery need to
replaced with new one(size AAA, 1.5V x 3).
4. OPERATION INSTRUCTIONS
P.9
4.8 Auto Power Off:
By default, when the meter is powered on, it is under auto power off
mode. The meter will power itself off after 30 minutes if no key
operation.
One may press and hold “HOLD” button and then power on the
meter and there will be two successive beeps to indicate that auto
power off is disabled.
4.9 Low Battery Condition:
The temperature meter incorporates visual low battery indication as
follows:
