The multimeter is known as an extremely complex ampere and volt measuring device. There are still a variety of multimeters capable of measuring capacity and resistance. These are extremely useful devices for a wide variety of measurements during circuit testing and the like. It is among the most preferred devices for professionals.
Determining the voltage rating
First and foremost, you need to look on the battery charger. You will see a label to determine the proper voltage rating. It is usually printed on said battery. After that, you are going to need to set the multimeter so that it has the same nominal measurement as the charger. As an example, you will only need to set the multimeter to 12 volts if the charger is 12 volts as well. You can see this page for more examples. If the charger is 20 volts, you can set the multimeter to 24 volts. Then you can plug the battery charger into an AC outlet. Then, simply press the probe button on the metal terminal of your multimeter. Finally, connect the metallic and the red positive probe of your multimeter.
Check the multimeter from time to time
The multimeter should be monitored continuously. This vigilance will let you know if the voltage rating of your battery is slightly lower than what is visible on the multimeter. In general, the voltage listed on the charger is likely to be high. The reason for this is that almost all chargers have the common goal of providing considerable energy for the battery that gets a fast charge. In case the multimeter indicates a charge below normal, then the charger may become faulty shortly. If the charger works normally after checking, while the charge is missing in the batteries, then you are facing a common problem with rechargeable batteries.