The Metrix Plus - 8500 Hz Digital Sound Level Meter is an accurate digital noise level sensor. The 8500 Hz Digital Sound Level Meter can be used for industrial, environmental, mining and aircraft purposes. The Digital Sound Level Meter records the level of sounds and converts it into a Hertz value. The Metrix Plus - 8500 Hz Digital Sound Level Meter sensor is protected by a soft cushioning, which does not affect the final reading. The Sound Level Meter is a lightweight device operated on batteries, making it a handy and portable device. The material used to build the device makes it very sturdy. Product Specifications: Company: Metrix Plus Country of Origin: India Microphone: 1/2-inch condenser microphone Accuracy: ± 1.5 dB Measuring range: 30 - 130 dBA 35 - 130 dBC Frequency range: 31.5 - 8,500 Hz Resolution: 4 digits and 0.1 dB Sampling frequency: 2 times / sec