Tachometer à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ ÁÔàµÍÃìÇÑ´Ãͺ ÇÑ´Ãͺ rpm à¤Ã×èͧÁ×ÍÇÑ´Ãͺ à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ ÇÑ´Ãͺ´Ô¨ÔµÍŠࡨì à¤Ã×èͧÇÑ´Ãͺ ࡨìÇÑ´Ãͺ Speed Motor à¤Ã×èͧÇÑ´ÃͺÁÍàµÍÃì à¤Ã×èͧÇÑ´Ãͺ´Ô¨ÔµÍÅ RPM Meter > Extech 461995 à¤Ã×èͧÇÑ´ÃͺẺÊÑÁ¼ÑÊ / áʧ Combination Contact/Laser Photo Tachometer Combination Contact/Laser Photo Tachometer Combines both contact and non-contact models for use in all applications Characters on display reverse direction depending on contact or photo mode Uses a Laser for greater distance non-contact measurements up to 6.5ft (2m) Memory/readings button holds last reading for 5 min and recalls min/max readings Specifications (Photo mode/Contact mode): Range (RPM): 10 to 99,999 / 0.5 to 20,000 Accuracy: 0.05% rdg +1 digit Sampling Time: 1 Sec > 60rpm / 1 Sec > 6rpm Surface Speed: 0.2 to 6560ft/min / 0.05 to 1999.9m/min Resolution: 0.1rpm (1000rpm) Power: 4 AA batteries Dimensions: 8.5x2.6x1.5”(215 x 65 x 38 mm) Weight: 10.6 oz (300 g) Tachometer à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ ÁÔàµÍÃìÇÑ´Ãͺ ÇÑ´Ãͺ rpm à¤Ã×èͧÁ×ÍÇÑ´Ãͺ à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ ÇÑ´Ãͺ´Ô¨ÔµÍŠࡨì à¤Ã×èͧÇÑ´Ãͺ ࡨìÇÑ´Ãͺ Speed Motor à¤Ã×èͧÇÑ´ÃͺÁÍàµÍÃì à¤Ã×èͧÇÑ´Ãͺ´Ô¨ÔµÍÅ RPM Meter > Extech 461995 à¤Ã×èͧÇÑ´ÃͺẺÊÑÁ¼ÑÊ / áʧ Combination Contact/Laser Photo Tachometer