?High Precison?:DANOPLUS sound meter can measure 30-130dB range, the accuracy is -1.5dB /+1.5dB with 0.1dBA resolution; Frequency response: 31.5~8.5KHz; FAST SLOW respond: 2 times/second (FAST), 1 time/second (SLOW) ?Sound Data Logger?: This sound level meter can record 32000 groups data with date and time, this function is compatible with Windows 10, 8, 7, Vista and XP ?Multi-Functional Features?:The db meter designed with LCD backlight feature, MAX, FAST SLOW respond: 2 times/second (FAST), 1 time/second (SLOW) ?AC/DC Output?:AC/DC Output interface is on the side of noise measurement device, which can be better connected with other devices ?Wide Applications?This professional decibel meter is designed to used on different sound level, such as sound level around factory, home, school, office, concert, road, audio, etc