... the noise level from 35`140dB(A), Summary:HS5633 digital sound level meter is newly developed according to the ... maintenance, sound level set, high and low range, digital display of overload and oweload, AC and DC signal ... according to 0.1V/10dB, load impedance is 1MΩ);11. Power supply: 1 laminated cell of 9V, with ... collocation: main machine, fan cover, screw driver, handbag. Digital Sound Level Meter