Extech SL400 Noise Dosimeter with USB and NIST CalibrationThe Extech SL400 NIST is a compact, lightweight personal noise dosimeter designed to perform OSHA and IEC noise accumulation surveys, offering reliable measurement of total sound exposure over an 8 hour period. With a USB interface and NIST Certification, the SL400 ensures accurate compliance testing for OSHA, MSHA, DOD, ACGIH, and ISO standards. Engineered for versatility and ease of use, it allows users to monitor and document sound levels in