à¤Ã×èͧÁ×ÍÇÔ·ÂÒÈÒʵÃì ÍØ»¡Ã³ìÇÔ·ÂÒÈÒʵÃì Light meter Lux Meters à¤Ã×èͧÇÑ´áʧ > Light Meter with USB interface à¤Ã×èͧÇÑ´áʧ DT-1309 à¤Ã×èͧÇÑ´áʧ DT-1309 Light Meter with USB interface DT-1309 light meter is easy to use with pocket size and light weight, providing accurate display light level in terms of Foot Candles (FC) or LUX over wide range. Just turning the Function Switch to select the “lux” scale and setting the range to desired range, then removing the photo detector to light source in a horizontal position and reading the illuminance norminal from the LCD display. When the measurement is completed, replace the photo detector from the light source. Over-range indication Electronics range selection Long life silicon photo diode inside Measurement rate:1.5 times per second 4000 counts LCD display 41-segments Analog bargraph Peak Hold Relative mode Max and Data Hold Auto Power Off Low battery indication User selectable FC/Lux One USB cable is included for the connection to a PC. Optional Windows software is included for FREE (Note: the software is included AS IS. No software development kit or support available). Max Range 400,000 Lux / 40,000 FC Accuracy +5% + 10d(<10,000Lux) +10% + 10d(>10,000Lux) Max Resolution 0.1 lux/FC Measuring rate 1.5 times/second Photo Detector Dimensions 115mm x 60mm x 27mm Meter Dimensions (HxWxD) 165mm x 76mm x 43mm Weight 403g CEM DT-1309 Light meter Lux meter à¤Ã×èͧÇÑ´¤ÇÒÁà¢éÁáʧ à¤Ã×èͧÇÑ´áʧ