Noise Dosimeter, Includes Belt Clip, Carrying Case, Clip-on Microphone, USB Cable, Windscreen, Digital Display Screen Type LCD, Frequency Weighting A, C, Z, Maximum Frequency Measurement 8 kHz, Maximum Sound Level Measurement 143 dB, Minimum Frequency Measurement 20 Hz, Minimum Sound Level Measurement 30 dB, Number of Records Stored 1,000,000, Sound Level Measurement Accuracy +/-1 dB, Sound Level Measurement Resolution 0.1 dB, Interface USB, Features Data Logging The Extech(R) by FLIR personal noise dosimeter with USB Interface is ideal for employees who are exposed to loud noises. Sound level monitoring is essential to determine what protective measures are required. Perform OSHA and IEC Noise accumulation surveys to determine total sound exposure over an 8-hour period. USB interface desi.