SOUND METER: The handheld digital noise reader features a high-sensitivity microphone with a measuring range of 30 to 130dBA with an accuracy of +/- 1.5dB; IP54 rated for dust and water resistance; Requires 3x AAA batteries (not included) ACCURATE SENSOR: Provides precise sound readings with slow (1s) and fast (1/8s) settings for timely and accurate audio measurements of up to 0.1 decibels; Change response time and min/max readings on the device with the press of a button EASY READOUT: Features a large-font display for quick, at-a-glance readings, with a data hold function to keep measurements visible and optional backlight for use in low-light conditions; 5-min auto-off feature maximizes battery life APPLICATIONS: Ideal for monitoring loudness levels in various environments such as server rooms, data centers, office spaces, and industrial settings; Ideal for equipment testing and environmental assessments, providing real-time loudness conditions PORTABLE: Compact (2x6.4x1.1in/50x162.6x29.2mm) and lightweight (0.4lb/190g) noise tester is easy to store and transport; Made from durable ABS plastic with a non-slip design, is ideal for on-the-go measurements in various work environments