Flow RangesLow(L)5 mL–500 mL/minMedium(M)50 mL–5,000 mL/minHigh(H)300 mL–30,000 mL/minAccuracy1%VolumetricSizeSmall enough to fit easily in your hand slim enough to slide into a briefcase or toteWeight29 oz/820 gDimensions(H x W x D)5.5 x 6 x 3 in/140 x 150 x 75 mm
  User-Selectable Measurement UnitsVolumetric FlowmL/min   L/min   cc/min   cf/minPressure(Defender 520 only)mmHg  PSI   kPaTemperature(Defender 520 only)℃℉  Defender 500 Series SpecificationsApproximate Time per Reading1–15 secondsGas CompatibilityUse with non-corrosive,non-condensing,non-combustible gases,less than 70%humiditFlow ModesSuction or PressureMeasurement Cell StyleIntegratedTemperature and Pressure SensorsIn the flow streamPress.:3.5 mmHg(typical),7.0 mm(max) Temp.:0.8°C(typical),1.3°C(max)Reading StylesSingle(manual),Continuous or Burst,with averaging function user-selectablefrom 1 to 100 measurementsAC Adapter/Charger12V DC,> 250ma,2.5 mm,center positiveBattery System6V rechargeable,sealed lead-acid,6–8 hrs typical operationBattery Operational Time(5 cycles/min)3 hrs backlight on,8 hrs backlight offPressure and Suction Fittings1/4"ID Hose BarbWarranty1 year battery 6 monthsStorage Temperature0-70℃Ambient Humidity0-70%,non-condensingOperating Pressure(Absolute)15 PSIDisplayBacklit graphical LCDData Port(for use with Optimizer software)Serial (RS-232)Data Cable(for use with Optimizer software)1 meter(Defender Data Port to PC serial port)Protective CaseSoft side or Pelican case availableRoHS-and CE-compliant