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Digital PH Meter Pen of  Aquarium Pool Water  automatic calibration  with 3 in 1 Ec Meter Reverse Osmosis 50%off 

TDS water quality test pen is used to test the TDS value of water, the conductivity of water, in order to determine who's purity. At the same time, it has the function of testing water temperature and environment temperature, and it can be widely used in water treatment industry, drinking water industry, family, personal home travel, field operation and so on. Features 1. Digital display: accurate to 4 digits. Temperature compensation accurate to 0.1 2. Backlight function: green backlight while TDS value ≤40,red backlight while TDS value>40. 3. Auto-lock: TDS value stabillizes 4 seconds, instrument automatically lock readings. 4. One Touch function: Forget to turn off the power, automatically shut down after 2 minutes.  Technical parameters: testing range: 0-9990ppm Accuracy: ±2% F.S Battery:3.0V*1(button cell)   (NOT INCLUDE) Size: 16.2*3.0*1.6(cm)  Instructions: 1. Remove the protective cap.Press ON/OFF button. 2. Immerse the meter into the water/solution height no more than 4cm(From the beginning of TDS meter). 3. Waiting until the display stabilizes,the TDS Meter automatically compensates for temperature variations Once the readout is stabilized(30-45 seconds).TDS value stabillizes 4 seconds, instrument automatically lock readings. 4.After usage,shake off water from your meter or wipe it with a tissue. The platinum electrode design:     The platinum electrode design: high purity platinum sensor design, in the whole range of the measurement value to ensure accurate and stable. The key point of automatic calibration: Instrument has a point of automatic calibration function, calibration when the instrument allows the use of custom calibration liquid. You only need to enter a known conductivity value in the instrument and the sensor is immersed in the calibration solution, press the ENTER key, the instrument will be automatically calibrated. The data lock: simple measurement value lock function, in the conductivity measurement mode, press the HOLD key, the instrument automatically locks the current measurement value, once again button, the instrument returns the measurement mode.