Feature:1. [Accuracy Instrument] DO9100 is an accuracy instrument for measuring dissolved oxygen and temperature. With built in microcomputer processor to calculate and compensate all measurement data related to dissolved oxygen and temperature.2. [Probe] A membrane with a polarographic sensor and a thermistor for temperature measurement and temperature compensation. The permeable membrane separates the measured solution from the sensing electrode and allows oxygen to pass through the membrane to react.3. [Digital Display Screen] It is equipped with a clear digital display screen, which is convenient for reading data. If not in use, it will automatically shut down in 8 minutes, with low battery prompt, detachable probe, and easy to replace.4. [Temperature Compensation Function] The solubility of oxygen will be affected by temperature, atmospheric pressure and salinity. Our instrument has a temperature compensation function, which can meet normal use.5. [Wide Application] Suitable for measuring the dissolved oxygen level and temperature in aquariums, swimming pools, pond, freshwater aquaculture, marine aquaculture, school teaching experiments, laboratory sterile environment, aquaculture, scientific research and other fields.Specification:Item Type: Dissolved Oxygen MeterMaterial: ABSModel: DO9100Battery: 1.5V LR44 x 3 Battery (Battery Not Included)Uses: Suitable for freshwater aquaculture, marine aquaculture, swimming pools, beverage factories, sewage treatment plants, laboratories.Measuring RangeOxygen concentration (mg/L)0.0-40.0mg/LDissolved Oxygen Saturation (%)0.0-300.0%Temperature0.0-40.032.0-104.0ResolutionOxygen concentration (mg/L)0.1mg/LDissolved Oxygen Saturation (%)0.10%Temperature0.1C; 0.1FAccuracyOxygen concentration (mg/L)1.5%F.SDissolved Oxygen Saturation (%)1.5%F.STemperature0.5Calibration ModeSupport single point or double point automatic calibration, that is, zero point or automatic 100% calibration in airResponse Time45s (response at 20)Temperature Compensation RangeAutomatic (0-40)Height CompensationWithoutBattery PowerLow battery warningShut DownAutomatic shutdown about 15 minutesUse Environment0.1-40.0 RH maximum 90%.Package List:1 x Host (Battery Not Included)1 x Dissolved Oxygen Electrode6 x Dissolved Oxygen Membrane Group1 x Manual