* Permits choice “A”, “C” , “F” weighting and “Fast” / “Slow” response times. * Offers 4 measurement parameters: Lp (sound level); Leq (Equivalent Continuous A Sound Level ); Lmax ( Maximum Sound Level) and LN (Percent of all readings over alarm value set ). * DC output :1 0 m V / d B. * Can memorize 30 groups of measurement results and measuring conditions. * Auto range selection and digital display with no guessing errors. * Use “USB data output” and “RS-232 data output” to connect with PC. * Provide “Bluetooth ™ data output” choice.