TA8151 Sound Level Meter is an instrument designed to measure ambient sound levels. It's equipped with condenser microphone, which combines precision with stability and reliability, widely used in environmental noise testing, quality control, safety management in factory, school, community, office, construction site, etc.. Specifications: Material: ABS Brand: TASI Model: TA8151 Measurement Range: 30~130dB Resolution: 0.1dB Accuracy: 1.5dB(94dB #64;1kHz) Frequency Range: 31.5Hz ~ 8.5kHz Display: 3 digit display(MAX.1999) Response Time: (Fast)0.5s;(Slow)1s Microphone: 1/2inch electret condenser microphone Power Supply: 2 * 1.5V AAA battery (Not Included) Operating Condition: 0~40; 10%~80%RH Storage Condition: -10~60; 10%~70%RH Item Size: 205 * 55 * 30mm / 8.07 * 2.16 * 1.18in Item Weight: 100g / 3.52oz Package Weight: 240g / 8.46oz Package Size: 24.7 * 9.2 * 5.2cm / 9.72 * 3.62 * 2.04in Packing List: 1 * Sound Level Meter 1 * Foam Ball 1 * Storage Bag 1 * User Manual (English)