Feature:1. With automatic temperature compensation function, the temperature of the solution can be automatically compensated for 0‑40℃, and the reading is accurate and stable.2. It is suitable for freshwater aquaculture, marine aquaculture, swimming pools, beverage factories, sewage plants, and laboratories.3. Small pen‑shaped design, light and easy to move, you can test water anywhere to get the purest water.4. High accuracy, quick response, quick test results can be detected, any 0.0‑40.0mg/L liquid can be tested.5. The digital screen display with backlight makes the data read more clear and convenient.Specification:Item Type: Dissolved Oxygen MeterMaterial: ABSWeight: Approx. 328g/11.6ozDissolved Oxygen Meter Size: Approx. 35 x 155mm/1.4 x 6.1inElectrode Length: Approx. 150mm/5.9inCable Length: Approx. 1.5m/4.9ftMeasuring 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, 0 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: Support Automatic BacklightPower Supply: Automatic Shutdown for About 8 MinutesBattery Attributes: 3 x 1.5V 150MAH LR44 Battery (Battery Not Included)Use Environment: 0.1-40.0℃ RH Maximum 90%Instructions for Use:1. Connect the electrodes, press the power button, power on, the screen will displ