applicable stangdards	iec pub 60651 type2, ansi s1.4 type 2
digital display	4digital lcd, 0.1db resolution,up-dated every 0.5s
measurement level	25～130db
measurement frequency range	31.5hz to 8 khz
frequency weighting	a and c
time weight	fast and slow
microphone	1/2 inch electret condenser microphone
measurement level range	5 ranges in 10-db step:25～80db 30～90db 40～100db 50～100db 60～120db 70～130db
quasi-analong bar indicator	1-db steps,60db display range ,up-dated every0.125s
display warning function overrange indicator underrange indicator	ov displayed at the upper limit un displayed at the lower limit
manual data memory capacity	99 sets
analong ac/dc output	2vrms （at full scale）, 10mvdc/db
power supply	one 9v battery （006p to iec6f22） ac adapter
battery life	about 50 hours
weight	approx.310g