Instruments & Machinery Sales Corporation Offers a Digital Sound level Meter (dB meter) . The display is made up of 18mm (0.7”) LCd in 3½ digits Frequency weighing is designed to meet IEC 651 type .The characteristic is simulated asd human ear listing response in a typical make , the environmental Sound level measurement , always select to A and C weighing.Condensor microphones are provided for high accuracy and long term stability, along with LCD display warning indicator for over/under load term stability , along with LCD Display warning indicator for oveer/under load low battery indiactor .The units Have built-in adjust VR,available for easy calibration .These units are housed In strong ABS plastic case with small and light weight 400 grams .The complete Unit works on DC 9V battery with power consumpition of DC 6mA approx .Typical areas of use include : factories , traffic , radio speaker etc.. Quality inspection are applied for every kind of sounder ,such as air –conditioner exhaust pipe,automobiles, TVs or videos, public sanction for ventilation equipment, motor and noise inspection for factory quality control .