â·ÃÊͺ¶ÒÁÃÒ¤Ò à¤Ã×èͧÁ×ÍÇÔ·ÂÒÈÒʵÃì ÍØ»¡Ã³ìÇÔ·ÂÒÈÒʵÃì à¤Ã×èͧÇÑ´ÃдѺ¤ÇÒÁ´Ñ§àÊÕ§ Sound Meter > à¤Ã×èͧÇÑ´àÊÕ§ à¤Ã×èͧÁ×͵ÃǨÇÑ´»ÃÔÁÒ³àÊÕ§ÊÐÊÁ Noise Dosimeter 407355 Meets ANSI S1.25(1991) Type 2, ISO-1999, BS 402 (1983) Noise Dosimeter 407355 Noise Dosimeter with PC Interface Measure total sound exposure over an 8-hour period Perform OSHA and IEC Noise accumulation surveys Adjustable Criterion Level, Exchange Rate, and Threshold Ideal for personal/workplace accumulated noise exposure Also has storage of 5 separate surveys, Bi-directional RS-232 with Windows® compatible software and a real time clock. Standards: Meets ANSI S1.25(1991) Type 2, ISO-1999, BS 402 (1983) Range/Resolution: 70 - 140 dBA / 0.1dB Digital Display: LCD 0.01-9999% Criterion Level: 80, 84, 85, or 90dB Exchange Rate: 3, 4, 5 or 6 dB Threshold Level: 70-90 (1db steps) Frequency weighting: A Response Rate: Fast or Slow High Level Detector/Peak Flag: 115dB / 140dB Dimensions/Weight: 4.2x2.5x1.3” (106x64x34mm) 8oz. (227g) incl.batteries Microphone: 1/2 inch electret condenser with 31” cable Battery Life: 34 hrs Event Storage: 5 surveys RS232 Interface: Yes Real time clock: Yes 407355 Extech Sound Meter à¤Ã×èͧÇÑ´ÃдѺàÊÕ§ à¤Ã×èͧÇÑ´àÊÕ§