• It measures, on an internationally standardised decibel scale, the value of the alternating pressure waves of the air which are caused by the sound.
• ACD is making available instrument 'S-3000' which confirms to the requirement of 'Type-2' instrument as per IS 9779-1981.
• Other features are 40 db to 140 db range; A and C weightage; regular logging of this parameter provides early warning of breakdown; offered as portable instruments for individual parameters as well as an integrated meter; long operational life; trouble-free functionality; rugged design.