The answer to 'when to replace electrical meter' is that you should typically replace your electrical meter every 10-15 years. Electrical meters are designed to last a long time, but they can wear down over time and become less accurate. Replacing your meter on a regular schedule ensures that your home's electricity usage is being measured accurately, which helps you avoid overpaying on your utility bills.
It's also a good idea to have your meter inspected by a licensed electrician if you notice any signs of damage or wear, such as cracked or broken housing, loose connections, or inaccurate readings. An electrician can assess the condition of your meter and let you know if it needs to be replaced sooner than the typical 10-15 year timeframe.