... sound level meter standard of GB/T17181. The measured data can be transferred to computers through RC232C connector and ... . 1.Basic configuration: TL5670B sound level meter, cable, program floppy disk, fan cover, horologe screwdriver, AC accessories (external power), case2 ... time T60, LepnAutomatic acquisition and storage: 200 teams of data single team Measuring time setting and clockMan, 10s,1min,5min ...