SOUND LEVEL METER Features Lightweight and compact design A, C, and F weighting modes 28 to 130 dB measurement range Measures Lp, Leq, Le, Lmax, Lmin and Lx Equipped with highly sensitive electret condenser microphone Large 4 digit display with 0.1 dB resolution with backlighting and analog bar graph Add additional functions with the program cards Includes SD card for data storage, windshield, carrying case, AA batteries, hand strap, and calibration certificate   Specifications Parameters    Lp, LA, LAeq, LAE, LAmax, LAmin, LAN, Lpeak, LAtm5 Ranges    A: 28 - 130 dB, Z 39 - 130 dB Weighting     A, C and Z Time Response     Fast or Slow Microphone     TYPE 7146nl (-28dB, Stand-alone -26dB) Standards     Type 2 (4431) standards for ANSI S1.4 1983, IEC 61672-1 Power Supply     4 AA Batteries or optional AC Adapter (Battery life: approx. 9 hours) Size & Weight     W3.4" x H12.9" x D1.9", Approx 1 lb.