The EXTECH SL400 Personal Noise Dosimeter is a handheld device powered by a 9V battery that accurately measures and records noise exposure levels for occupational health and safety purposes. This compact dosimeter is designed for personal use, allowing users to easily monitor and track their daily noise exposure levels. Ideal for workers in various industries, the EXTECH SL400 provides reliable data to help ensure compliance with workplace noise regulations and ensure the health and safety of individuals exposed to high noise levels.