Product Introduction: CEL-240 digital sound level meter, using advanced DSP technology, meets the accuracy requirements of ANSI and IEC Type 2, with a measurement range of 30-130dB and a dynamic range of 70dB. Suitable for daily measurement in multiple fields, especially for industrial hygiene measurement and mechanical noise measurement in the workplace. A&C frequency weighting and slow time response are used for NRR evaluation of hearing protection requirements, with no attenuation Z-large value retention function, 30 second automatic backlight, can be fixedly installed and measured with a standard tripod, 3 × AA alkaline batteries can work for more than 35 hours, or external power can be used with a USB interface