Specification:Item Type: Dissolved Oxygen MeterMaterial: ABSColor: As shown in the pictureDissolved Oxygen Meter Size: Approx.155x35mm/6.1x1.38inCable Length: Approx.1.15m/3.8ftElectrode Length: Approx.150mm/5.9inWeight: Approx.331g/11.7ozMeasuring range:Dissolution: 0.0-40.0mg/LDissolved Oxygen Saturation: 0.0-300.0%Temperature: 0.1-40.0?; 32.0-104.0?Resolution:Dissolution: 0.1mg/LDissolved oxygen saturation: 0.1%Temperature: 0.1?; 0.1?Accuracy:Dissolution: 1.5%F.SDissolved Oxygen Saturation: 1.5%F.STemperature: 0.5?Calibration Method: Support single-point or double-point automatic calibration, that is, null point or automatic 100% calibration in the air.Response Time: ?45s (90% response at 20?)Automatic Temperature Compensation Range: 0-40?Battery level: low battery warningBacklight: Not SupportedPower supply: automatic shutdown for about 8 minutesUse Environment: 0.1-40.0? RH maximum 90%Battery: 3x1.5V LR44 battery 150MAH (Not included)Operating Environment: 0.1-40.0?, RH maximum 90%Package Included:1 x Dissolved Oxygen Meter(Battery Not Included)1 x Electrode6 x Replaceable Electrode Head1 x Instruction Manual