What is the maximum total voltage that can be measured using two identical 0-300 Volt range DC meters connected in series?

When two identical 0-300 Volt range DC meters are connected in series, their maximum voltage measurement capabilities add together. Each meter is capable of measuring up to 300 volts individually. Therefore, when they are combined in series, the total voltage measurement that can be accurately captured is the sum of the two meters' maximum ratings.

In this scenario, the first meter can measure up to 300 volts, and the second meter can also measure up to 300 volts. Thus, when connected in series, the total maximum voltage that can be measured is 300 volts + 300 volts, which equals 600 volts.

This fundamental principle of series connections — where the total voltage capacity is the sum of the individual components — confirms that the correct answer is 600 volts.