Descriptions:C-100 Versatility Portable TDS/EC/Salt/S.G/TEMP Water Quality Tester. Mainly used for testing TDS (ppm/), EC (uS/cm, mS/cm), salt (%), S.G (seawater gravity) and TEMP (°c/°f), Featherweight is simple and portable. Put the meter into the solution, it can respond to the reading quickly and steadily, and has calibration function to ensure high accuracy. The measuring range is large and wide, which can measure both freshwater salinity and sea saltThis is an amazing digital Water Quality Monitor Tester for home use, swimming pools, drinking water, aquariumsPacking List1*5 in 1 Water Quality Tester1*English ManualSpecification:Range: 0 to 10000uS/cm 10.01-19.99mS 20.1-400mS/cmResolution: 1uS/cm; 0.1ms/cm;Accuracy: ± 2% F.STDS:Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0ppt (Automatically Out of Range)Resolution: 1ppm; 0.1 points Accuracy: ± 2% F.W Salinity:Range: 0.00 to 25.00%Resolution: 0.01%Accuracy: 0.01-5.00% (± 0.1%) 5.10-25.00% (± 1%)SG: 1.000-1.222Calibration: EC: Optional three-point calibration (1413uS 12.88mS 111.8mS)Temperature compensation: ATC functionOperating environment: 0 to 80.0°c (32.0-176F); TDS Ratio: 0.5Temperature Range: 0.1-80.0°c 32.0-176°fTemperature Accuracy: +0.5°cTemperature Resolution: 0.1°c/°fAuto Power Off: 5 minutesPower: 3x1.5 LR44Screen Size: 28*17mmSize/Weight: 159*34*16mm (6.31*1.3*0.6in)/60g (2.1oz)Display: Support BacklightBattery: Low Battery IndicatorTroubleshootingTurn On but Do Not Display1. The battery is not installed or the battery is low or not installed correctly;2. Do not press the power button correctly; Solution:1. Remove the battery packaging, reinstall the battery, or replace a new battery;2. Check whether the positive and negative terminals of the battery are correct;3. The above methods are correct, the instrument can not be opened, please return to the factory or agent. Unstable for reading1. Air bubbles around the electrode will severely affect the reading. To reduce air bubbles, fully immerse the electrode and twist it in the air to eliminate air bubbles;2. The solution may be asymmetrical, resulting in unstable readings;3. The probe is not immersed deep enough in the solution;4. The probe is broken;5. Measurement of environmental disturbances. C-100 Multifunctional Water Quality TesterWorking Mode1. Press ON/OF, turn on the meter, remove the protective cover, insert it into the solution to be tested, and do not immerse it over the dip line. Then gently shake it a few times in water to eliminate bubbles around the electrode and read the correct measurement value at a stable value2. Press MODE/CAL to enter different models. The unit of TDS is PPM or PPT, the unit of EC is usa or mS, the unit of salt is %, and the unit of specific gravity of seawater is S.G.3. Press the HOLD/TEMP button, it will be displayed in the top left corner of the screen, which means the value is being done, then remove the meter from the solution and read the value, press the HOLD/TEMP button again to exit the hold.4 mode. Hold hold/TEMP for a long time, the screen will change between °c and °fCalibrationAfter long-term use, you need to calibrate. Put it into the standard solution, enter the TDS/EC mode, press the mode/CAL mode for four seconds, enter the automatic calibration mode, the corresponding value will flash on the screen, press the HOLD/TEMP button to make the Plus sign or mode/CAL decrement, and then calibrate to the standard solution value, after three flashes, the calibration is complete