... and read the noise level from 35`140dB(A), Summary:HS5633 digital sound level meter is newly developed ... such as Max. maintenance, sound level set, high and low range, digital display of overload and oweload, AC ... 3. Frequency-weighted features: AC weighting ;4. Sound level set function: random set within 40130dB;5. Demodulation ... machine, fan cover, screw driver, handbag. Digital Sound Level Meter