à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ ẺàÅà«ÍÃìáÅÐẺÊÑÁ¼ÑÊ Tachometer Contact / Non Contact laser 2 in 1 DT2236B General: 5 digit large LCD display digit height 16 mm Measurement range 2.5 - 99999 rpm (laser mode) 0.5 - 19999 rpm (contact mode, linear surface speed) 0.05 - 1999.9 m/min (contact mode, linear surface speed) Resolution 0.1 rpm (2.5-999.9 rpm) / 1 rpm (above 1000 rpm) 0.1 rpm (0.5-999.9 rpm) / 1 rpm (above 1000 rpm) 0.01 m/min (0.05-99.99 m/min) / 0.1 m/min (above 1000 rpm) Accuracy ±0.05% + 1 digit Sampling rate 0.5s (above 120 rpm) Working distance 50 mm - 800 mm (laser) Operating current 35 mA Memory auto recording for MAX/MIN/LAST measurement data Time base 6MHZ quartz oscillator, with 10 x 10 (0 - 50ºC) accuracy Power supply 4 x 1.5V AAA size battery DT2236B photo tachometer Stroboscopes Tachometer TLEAD ÇÑ´Ãͺ ẺÊÑÁ¼ÑÊ ÇÑ´Ãͺ ẺäÁèÊÑÁ¼ÑÊ ÇÑ´ÃͺẺÊͧÃкº à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÃͺ