... : 0.001Ω, Data memory: 99 sets, Alarm setting: 1~199(Ω), Buzzer alarm. Optional function of RS232 interface data upload . ... Easy to result in accident hidden trouble due to battery off.With fastening screws, Secure, Reliable, Easy battery replacement. ... "Beep-beep-beep” alarm tone, Alarm Symbol Flashing, Press AL key to turn on, turn off Alarm or set Alarm Threshold.Interference Signal Recognition ...