à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ Tachometer ࡨìÇÑ´Ãͺ Speed Motor à¤Ã×èͧÇÑ´ÃͺÁÍàµÍÃì à¤Ã×èͧÇÑ´Ãͺ´Ô¨ÔµÍÅ RPM Meter > Extech 461750 à¤Ã×èͧÇÑ´ÃͺẺÊÑÁ¼ÑÊ Mini Contact Tachometer Extech 461750 à¤Ã×èͧÇÑ´ÃͺẺÊÑÁ¼ÑÊ Mini Contact Tachometer PocketTach™ Mini Contact Tachometer For rpm and surface speed measurements Large easy to read LCD display Hold button freezes displayed readings Ergonomically designed and pocket size housing with protective finger guard Surface wheels enable tachometer to measure linear surface speeds in ft/min, m/min, and yd/min Specifications: Display Counts: 99,999 count LCD Range: RPM: 10-20,000 ft/min: 3-6,560 m/min: 1-1,999.9 yd/min: 1-5,000 Basic Accuracy: +/-(0.1%rdg +2 digits) Sampling Time: 1 second Max RPM Resolution: 0.001 ft/min Resolution: 0.0001 Dimensions: 5.87x1.97x1.3" (149x50x33mm) Weight: 5oz (142g) 461750 Extech Tachometer ࡨÇÑ´Ãͺ à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ ẺÊÑÁ¼ÑÊ