Feature: 1. HIGH ACCURACY: Noise meter has a high accuracy probe made of pure copper plated material, equipped with windproof noise elimination ball, more stable and accurate measurement. 2. HIDDEN BRACKET: Sound level meter with hidden bracket design, can be opened or closed with the use of the scene, easy to use, portable and space saving. 3. FREQUENCY WEIGHTING: Frequency weighting A is the amount of noise felt by the human ear, and frequency weighting C is the characteristic of mechanical noise. 4. FAST AND SLOW MEASUREMENT: For general environmental measurement use fast response rate, slow response rate for noise level changes relatively large environmental measurement. 5. APPLICABLE: Noise measure device can be used to measure the sound level of sound equipment in work and life, such as factories, workshops, schools, residential, office areas, traffic roads, sound, etc. Specification: Item Type: Noise Tester Material: ABS Color: Black Microphone: 1/2 Inch Condenser Microphone Accuracy: ±2dB Frequency Response: 31.5Hz to 8.5KHz Dynamic Range: 30dB Measurement Range: 40‑130dBA, 40‑130dBC Frequency Weighted Characteristics: A and C Characteristics Digit Display: 4 Digits, Resolution 0.1dB, Sampling Rate 2 Times Per Second Analog Scale Display: 1 Scale Represents 1dB, Sampling Rate 2 Times Per Second Measurement Range: 40‑70dB, 60‑90dB, 80‑110dB, 100‑130dB, 40‑130dB Overload Mark: OVER, HI, UNDER, LO Symbols AC Signal Output: 0.707Vrms Per Full Scale, Output Impedance About 600Ω Dynamic Characteristics: FAST, SLOW Response Rate Maximum Value Lock: MAXIMUM Power On Self Test Time: About 4 Seconds Operating Environment: 0‑40°C, 10‑70%RH Storage Environment: ‑10 to 50°C, 10‑80%RH Power Supply: 1 x 9V Battery (without Battery). Package List: 1 x Noise Tester1 x Data Line1 x Cloth Bag1 x Instruction Manual