What is the real time clock backup feature?
An additional internal battery supports the clock when the main battery is removed. You can leave the battery out of the meter for 72 hours and still retain the time and date. If you replace the battery within that time, the meter will ask you to verify the time and date. The internal battery will automatically recharge. If you do not replace the battery within 72 hours, the meter will retain the time and date that was stored before the 72 hours.
