Yes, an M3 gas meter is commonly used in metric countries. It is a unit of measurement for gas volume and represents one cubic meter of gas.
You DON'T
The NEC does not address this situation. Your local utilities may have rules on this. Use common sense. You would not want any electrical device near a gas meter that could leak. Just do not put one close to a gas meter and you know you will be safe. If you have an outdoor gas furnace and want to install a GFCI near it just make sure to install it as far from the gas meter as possible.
A device that measures natural gas is called a a meter
There are hundreds of "normal" gases. Hydrogen is one of them. Are you talking about stove gas ? Car "gas" which isn't even a gas ? You really need to be more specific. Less pedestrian wouldn't hurt either.
The gas meter on your house is sufficient,
The purpose of a gas meter is to monitor how much gas a particular house is using. Customers are then billed according to how much gas they have used from the meter.
No! the gas company will install one for free. However, it may cost to add a gas line to a house.
Standard meter will suffice, need to know pressure from meter to house. Size pipe appropriately for gas pressure coming into house X distance to water heater. Gas company or plumber should be able to help with this calculation.
There are a few different places that an electricity meter on a house could be located. Typically an electricity meter is either around in the back area of a house or located to the side of a house. Sometimes an electricity meter can be found immediately to the front of a house property.
The meter has to be installed on the exterior using black steel pipe in the home.
You call a gas technician. A problem like that could be too dangerous for you to deal with.
If your furnace is less then 50000btus then yes.
Pleas hire a ticketed technician.
There are several meters that could be attached to a house. Electricity,gas and water are all measured by separate meters located in various places on a house.
Check with your utility company; you may have other gas utilities in use as well.
house natural gas should have shutoff valve at the meter outside of house. I think you need to talk to the gas company. If this is propane tank as your supplier. It should be obvious on those.