As a result of it being easy to miss that a meter has changed range, a lot of instructors started requiring their students to use manual ranging.
Why do the instructors require manual ranging?
When using automatic ranging to work with the meter of an automotive, there is no flashing light that is given if the meter changes the range it is using.
Students can therefore miss this change quite easily. Working with manual ranging however, the meter will not be able to change ranges unless the students sets it this way. It is therefore harder to miss a change in range.
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