à¤Ã×èͧÇÑ´ÃдѺ¤ÇÒÁ´Ñ§àÊÕ§ Sound Meter > Professional Sound Level Meter à¤Ã×èͧÇÑ´àÊÕ§ DT-805 / Standard CE , IEC651 Type 2 , ANSI S1.4 Type 2 / DT-805 Sound level meter has a wide dynamic range from 30 to 130dB.It has different frequency weighting A and C to respond to human sense or machine monitoring purposes.For different sound pattern,it also supplies Fast and Slow time constant setting.Analog output also provided for other use. 1.5dB Accuracy Level range:30~130dB Features Provides 1.5dB accuracy Meets IEC651 type 2 standards Newly Design Shape High Performance Max Hold and Data Hold Function Specifications Level Range Low=30~100dB High=60~130dB Accuracy ±1.5dB(ref 94dB @ 1KHz) Frequency Range 31.5Hz to 8KHz Frequency Weighting A,C Time Weighting Fast,Slow Auxiliay Outputs AC/DC Signal Output Battery Type 9V Battery NEDA 1604,IEC 6F22,JIS 006P Operation Temp 0℃~40℃(<80%R.H.) Storage Temp -10℃~60℃(<70%R.H.) Size(HxWxD):210mm x 55mm x 32mm Weight:230g ccessories:9V battery,Carrying case and Manual. à¤Ã×èͧÇÑ´ÃдѺ¤ÇÒÁ´Ñ§àÊÕ§ Sound Meter > Professional Sound Level Meter à¤Ã×èͧÇÑ´àÊÕ§ DT-805