The noise level where there? Phone number? 0371-66959363 noise meter decibel noise tester noise meter to use GM1351 parameters: design standards: ---- A International Committee of the standard IEC651 TYPE2 ---- American National Standard ANSI S1.4 TYPE2 * measurement range: 30 ~ 130 dBA * Accuracy: ± 1.5 dB * Digital & Resolution: 4 & 0.1 dB * Frequency response: 31.5Hz ~ 8.5KHz * Frequency Weighting: A weighted (analog of the human ear) * Sampling Frequency: 2 Maximum times / sec * Microphone: 1/2 inch condenser microphone * lock * auto-sensing backlight * Low power * Automatic shutdown * Packaging: Blister jam * Power supply: 9V battery (6F22) * Product size: 57 * 36 * 149 mm * Net Weight: 144 g (with battery) of Zhengzhou Huike Electronic Instrument Co., Ltd. Tel :0371 -66959363 / 55933205 Fax :0371-66,959,363 QQ: 769 689 242 (Falco instruments) Sales: Manager Zhao 13598018197 Web: http://www.huike17.com Headquarters Address: Erqi Square stuff Avenue, 19th Floor, Star City, the sun and the moon of South Street Interchange A3