SOUND LEVEL METER The Extech® Sound Level Meter / Datalogger offers both A and C frequency weighting measurements as well as FAST and SLOW response times. This Sound Level Meter / Datalogger displays and stores sound level readings from 30 to 130dB. Logged data readings are stored on an SD card ( included) for quick and easy transfer to a PC. High accuracy ( ± 1.4dB) meets ANSI and IEC 61672 class 2 standards. Shipped fully tested and calibrated. Includes ( 6) AA batteries, SD card, windscreen and a hard carrying case. High accuracy ± 1.4dB meets ANSI and IEC 61672-1 Type 2 standards 30 to 130dB measurement range Auto or Manual ranging AC analog output for connection to an analyzer or recorder Large backlit LCD display Stores 99 readings manually and 20M readings via 2G SD card Records readings with real date and time stamp User programmable sampling rate: 1 to 3600 seconds Min/ Max and Data Hold functions Auto power off with disable function Built-in PC interface Complete with 6 AA batteries, SD Card, wind screen, and hard carrying case Specification :  Range: 30 to 130dB ( 3 ranges)  Basic Accuracy: ± 1.4dB Frequency Range: 31.5 to 8000Hz Weighting: A and C Response Time: Fast ( 200ms) / Slow ( 500ms)  Datalogging: 20M data records using a 2G SD card Analog Output: AC PC Interface: USB Dimensions: 9.8 x 2.9 x 1.9 " ( 250 x 73 x 48mm)  Weight: 18.3oz ( 520g)