... is precise acoustics measuring equipment. It meets JJG188-2002 sound level meter verification standard, IEC60804 and I type sound ... ), slow(S), Max holdDetector True effective value, crest factor≥10Automatic measuring and storageLeq, Lae, SD, Lmin, L95, L90, L50, L10, ... time T60, LepnAutomatic acquisition and storage: 200 teams of data single team Measuring time setting and clockMan, 10s,1min,5min, ...