SOUND LEVEL METER The Extech 407732 Digital Sound Level Meter measures and displays sound pressure levels in dB from 35 to 130dB. The LCD is backlit for viewing readings in dimly lit areas. User selectable features for the Extech 407732 include Frequency Weighting ( A and C) , Response Time ( Fast and Slow) , Max Hold, and Range ( High and Low) . High accuracy meets ANSI and IEC 651 Type High and Low measuring ranges Data Hold and Max Hold functions Backlit display to view in dimly lit area Applications Enforcing community noise ordinances Meeting government safety issues ( OSHA)  Installing audio systems Product noise certification and reduction Specification: Display 2000 count LCD Range Low: 35 to 100dB High: 65 to 130dB Basic Accuracy ± 1.5dB Weighting ( A & C) Yes Response Time ( Fast/ Slow) Yes Condenser Microphone 0.5 " ( 12.7mm)  Dimensions 8.2 x 2.1 x 1.25 " ( 210 x 55 x 32mm)  Weight 8.1oz ( 230g)