... 3.30 years experience 4.best price TL5660 series precise impulse sound level meterIt meets IEC 61672 standard and the ... verification regulations.digital and watch hand display, different level measurementwith impulse, it can accurately test lower limit, upper limit impact ... effective value, peak valueTime weighting Fast (F), Slow(S), Impulse (I). Max hold, with AC/DC signal output connectorCan be ...