Professional DO9100 Dissolved Oxygen Meter Digital DO Test Water Quality Analyzer for Seawater Freshwater Fish Tank Aquaculture Professional DO9100 Dissolved Oxygen Meter Digital DO Tester Water Quality Analyzer for Seawater Freshwater Fish Tank Aquaculture DO9100 pen-type intelligent dissolved oxygen analyzer 1. The dissolved oxygen meter is a precision instrument for measuring dissolved oxygen and temperature. The dissolved oxygen probe is a thin film with an aurora sensor and a thermistor for temperature measurement and temperature compensation. The permeable membrane separates the measured solution from the sensing electrode, but allows oxygen to pass through the membrane to react and measure the concentration. 2. Dissolved oxygen refers to the concentration of molecular oxygen dissolved in water, usually expressed in milligrams/L (ppm) and saturation rate (%), that is, the percentage of dissolved oxygen in 1 liter of water. The oxygen concentration of our dissolved oxygen meter is 0.0-40.0 mg/L, and most of the dissolved oxygen meters on the market range from 0.0-20 mg/L. When measuring and calibrating, there is no need to open the protective cover of the electrode, just put the electrode in the solution for measurement. 3. Detachable probe, easy to replace, equipped with 6 probe protection covers. The film in the protective cover cannot be separated. After using for a period of time, the test value is inaccurate, the calibration is still inaccurate, and the film sleeve needs to be replaced. It adopts digital screen display with backlight, which is clearer and easier to read data. If not used, 8 minutes 4 4. Automatic shutdown. Low battery reminder. Oxygen solubility is affected by temperature, atmospheric pressure and salinity. Our instrument has a temperature compensation function, which can meet normal use. 5. It is very suitable for measuring the dissolved oxygen level and temperature in various aquariums, swimming pools, ponds, freshwater aquaculture, marine aquaculture, school teaching experiments, laboratory sterile environment, aquaculture, scientific research and other fields. Specifications : 1.Model Number: DO9100 2.Type: Portable Dissolved Oxygen Meter 3.Dissolved oxygen saturation: 0.0-300.0% 4.Measurement range: 0.0 to 40.0 mg/L 5.Accuracy: 0.3mg/L 6.Resolution: 0.1 7.Residual current: not more than 0.15mg/L 8.Response time: no more than 30s (90% response at 20C) 9.Automatic temperature compensation range: (0 ~ 40) C 10.Measuring range: Dissolved oxygen: (0.040.0)mg/L Temperature: (0 ~ 40) C 11.Basic error: Dissolved oxygen: 0.3mg/L Temperature: 1C 12.Power supply: 3*1.5V button battery (not included) 13.Dimensions (mm): 40*185 (without electrodes) 14.Size:185(mm) 15.Weight: 88g Packing List : 1*DO9100 meter 6*probe protectors 1*manual English Q:what is different from DO9100 with DO9100B? A:DO9100 with backlit Does the product contain batteries? A : No How to correct the instrument Calibration procedure Point calibration or two point calibration, any point calibration A little calibration: can meet the normal use 0.0% (anaerobic water) or 100.0% (air) Two-point calibration: 0.0% (anaerobic water) and 100.0% (air) simultaneous calibration The instrument is simple to calibrate. Make sure the probe is installed correctly before calibration Step 1:100.0% (air) -- Calibrate in the air after the value is stabilized at the starting state. Press CAL for five seconds to release the button, and the screen flashes 100.0%. When the flashing is completed, the calibration is completed Step 2:0.0% (anoxic water) -- Calibrate the anoxic water after the value is stabilized at the starting state. Press CAL for 5 seconds to release the button, and the screen flashes 0.0%. When the flashing is completed, the calibration is completed. _x000D_