How to measure 5 meters in the listening test? Can you measure it yourself?

Listening test is divided into left ear and right ear. The doctor will say some place names or words at a normal or lower volume 5 meters away from you to test whether you can hear. There are also 3 meters and 2 meters tests. When testing, put different cotton balls on your ears. If it is an instrument test, the hearing loss is within 35db (decibel), which is almost normal. The hearing test is more than 5 meters, and the hearing loss in one ear is more than 65db. It's already a severe hearing loss (the hearing test is estimated to be less than 2M), and some majors that need listening in universities and some positions when taking part in work are unqualified. Joining the army requires a binaural hearing test of more than 5M, and some secret services can be reduced to 5M in one ear and 3M in the other.