REED Instruments R8080 Sound Level Meter, Datalogger with Bargraph, 30 to 130 dB and NIST Calibration Certificate High accuracy of 1.4 dB meets Type 2 standards Record up to 64,000 datapoints and keep track with internal time and date stamp User selectable sampling rate from 1 to 60 seconds Digital analog bargraph Includes windshield ball, USB cable, PC software, batteries, hard carrying case and calibration certificate