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One can purchase a good panel meter from eBay or they can also purchase it from Amazon. Also, they can be purchased from an electronic store such as Radio Shack.
the number on the digital electric meter after the reading
Some thermometers any meter varies. Both then
No, on a service change all the wires have to be able to carry the current of the highest rated device. There are tow cables associated with your question. The one from the pole to the meter and the one from the meter to the main electric panel. The one to the meter is the responsibility of the power company and may well be large enough. Since it is in free air its current carrying capacity is not de-rated in the same way as the cable from the meter to your main panel. Since you will have to likely upgrade your main panel it is a good idea to replace the service entry cable to 100 A rating.
An analog meter is a device which represents the value of a measurement by a point or similar indicator. A digital meter indicates the measure by actual displaying the number representing the value. For example, an analog thermometer shows a temperature of 25 degrees by pointing halfway between the 20 and 30 while a digital one displays the digits of the number 25.