à¤Ã×èͧÁ×ÍÇÔ·ÂÒÈÒʵÃì ÍØ»¡Ã³ìÇÔ·ÂÒÈÒʵÃì à¤Ã×èͧÇÑ´ÃдѺ¤ÇÒÁ´Ñ§àÊÕ§ Sound Meter> à¤Ã×èͧÇÑ´àÊÕ§ Sound Level Meter SL801 ÇÑ´ä´é 30 - 130dB ¤ÇÒÁÅÐàÍÕ´ 0.1dB ¢¹Ò´¡ÃзѴÃÑ´ ˹éÒ¨Í Display ÁÕ·Ñé§ Analog áÅÐ Digital Sound Level Meter à¤Ã×èͧÇÑ´àÊÕ§ Model No.: xxx SL801 SL811 Photo Sound Level Meter à¤Ã×èͧÇÑ´àÊÕ§ Specifications Measuring Range 30~130dB A 35~130dB C 30~130dB A 35~130dB C 30~130dB A 35~130dB C Accuracy ±1.5dB ±1.5dB ±1.5dB Linearity Range 50dB 50dB 50dB AC/DC Output √ √ √ Auto power shut off √ √ √ Low Battery Indication √ √ √ Over Range Indication √ √ √ Frequency weighting A & C A & C A & C Sound measuring level selection √ √ √ Max hold function √ √ √ RS232 PC interface ___ ___ √ Calendar function ___ ___ √ Power 1.5V×4 Battery(SUM-3) Product Net Weight 178g 300g à¤Ã×èͧÁ×ÍÇÔ·ÂÒÈÒʵÃì ÍØ»¡Ã³ìÇÔ·ÂÒÈÒʵÃì à¤Ã×èͧÇÑ´ÃдѺ¤ÇÒÁ´Ñ§àÊÕ§ Sound Meter> à¤Ã×èͧÇÑ´àÊÕ§ Sound Level Meter SL801 ÇÑ´ä´é 30 - 130dB ¤ÇÒÁÅÐàÍÕ´ 0.1dB ¢¹Ò´¡ÃзѴÃÑ´ ˹éÒ¨Í Display ÁÕ·Ñé§ Analog áÅÐ Digital