... class sound level meter standard of JJG188-2002 sound meter verification regulations.digital and watch hand display, different level measurementwith impulse, it can ... effective value, peak valueTime weighting Fast (F), Slow(S), Impulse (I). Max hold, with AC/DC signal output connectorCan be ... 290mm×106mm×65mmWeight 0.67kg(without batteries) led indication precise impulse sound level meter