Sonel CMM-30 Manual De Uso página 65

 While performing the measurements with the battery
symbol displayed, the user must be aware of additional
measurement uncertainties or unstable operation of the
device.
 If the meter does not work properly, check the fuses and
batteries in order to ensure that they are in proper condi-
tion and properly installed in the device.
CMM-30 – USER MANUAL
63