Meters music OV-1-B-C-PRO User Manual page 10

Fig 1.0:
Prolonged exposure at high volume settings to the sound from headphones or earphones
can damage a user's hearing.
To minimise the risk of hearing impairment, a European standard has been issued
which specifies test procedures for measuring the sound levels from the headphones
and earphones of
personal music players and similar consumer equipment.
THE METER:
HEARING
SAFE
DAMAGE
85dB 91dB
94dB
97dB
55dB
110dB