SOUND LEVEL METER Features:  Large LCD display, easy to read. Max. Hold function for stored the maximum value on display. Frequency weighting networks are designed to meet the IEC 651 type 2. Warning indicator for over and under load. LCD display for low power consumption & clear read-out even in bright ambient light. A & C weighting networks are conformity to standards. Time weighting( FAST & SLOW) dynamic characteristic modes. Used the durable, long-lasting components, including a strong, light weight ABS-plastic housing case. AC/ DC output for system expansion. Build in adj. VR is available for easy calibration. Small and light weight design allow one hand operation. Condenser microphone for high accuracy & long-term stability. Low battery indicator Specification: Measuring Range : 30 - 130dB Accuracy : ± 1.5dB Frequency Range : 31.5HZ-8.0KHZ Linearity Range : 50dB Digit & Resolution 5Digits & 0.1dB Time Weighting Selection Fast/ Slow Microphone 1/ 2 Inch Electret Condenser Power : 9V ( Alkaline or DC Adapter)  Size : 2005 x 80 x 35mm Weight : 280 g