دور سنج تماسی DT2235A 

دور سنج تماسی DT2235A
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Characteristic

 Wide measuring range & high resolution
  Digital display gives exact RPM（surface speed、line length） with no guessing or errors
  The last value/max, value/rain, value will be automatically stored in memory and can be displayed by turn anytime
  The use of durable, long-lasting components, including a strong, light weight ABS-plastic housing assures maintenance free performance for many years. The housing has been carefully shaped to fit comfortably in either hand.
 
Technology features

 Display：5 digits, 18mm (0.6-inch LCD screen)
  Test Range：0.5 to 19,999 RPM (r/min)
  Resolution：0.1 RPM (0.5 to 999.9 RPM)
    1 RPM (over 1,000 RPM)
  Contact tach：0.5 to 19999RPM
  Resolution：0.1 m/min (0.5 to 999.9RPM)、1 m/min（over 1000RPM）
  Surface speed：0.05 to 19999m/min
  Resolution：0.01 m/min (0.05 to 99.99RPM)、0.1 m/min（over 100RPM）
  Accuracy： (0.05%+1 digit)
  Sampling Time：0.8 sec.(over 60 RPM)
  Test Range Select：Automatic
  Memory：Last value, Max. Value,Min. Value
 
Description

 Time Base：6MHz Quartz crystal
  Sampling time：0.5sec（over 120 RPM）
  Range select：auto range
  Circuit：Exclusive one-chip of microcomputer LSI circuit.
  Battery： 3 * 1.5V AA
  Power Consumption：Approx. 35mA (LED)
  Approx. 30mA (Laser)
  Operation Temp.：0 to 50°C(32 to 122°F)
  Size：184 x 76 x 30 mm
  Weight：204g (including battery)
  Accessories：4 * 1.5V AA Battery、 3 x Reflecting tape marks、1 x User manual
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