Features: Decibel meter uses a precise condenser microphone to capture sound. Equipped with A-weighting and C-weighting facilities that measure noise level from 30 to 130dB with an accuracy of ±1.5dB, Frequency from 30 to 8,000Hz. Perfect for monitoring noise level in communities, home theaters, audios system, workshops, schools, offices, factory. This sound level meter is measured noise level are expressed in decibels and displayed on 2.25-inch screen with backlit, it easy to read on a display design. The sound pressure level (SPL) meter has measurement values to represent the value of the sound produced within a certain time, and has data hold function. The non-slip side design ensures that the portable noise meter fit easily in the hand. Has low battery indicator. Specifications: Material: Plastic Range: 30-130dBA Accuracy: ±1.5dB Frequency Response Range:±30HZ-8kHZ Frequency weighting :Weighting Time Weighted: Fast 125ms Slow 1sec Microphone: Polarized Condenser Microphone Temperature: -20°C~60°C (-4°F~140°F)±1.5°C Humidity: 0~100%/±5.0% Battery: 3xAAA Batteries Needed(NOT Included) Size: Approx. 14.2x5.8cm/5.59x2.28in Package Includes: 1x Decibel Meter 1x User Manual 1x Drawstring Pouch note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.