PH Meter With ATC 3 in 1 PH TDS Temp Tester High Accuracy Pocket Size PH Tester 0.00-14.00 For Pools, Drinking Water, Aquariums 40% Off TDS/PH/EC/Temperature Meter 4 in 1 Measuring range: pH:0.00-14.00pH; TDS: 0-19990ppm; EC: 0-19990S/cm Resolution: 0.01 pH; 1ppm; 1S/cm; 0.1; 0.1F Accuracy: pH: +/-0.01 pH; TDS/EC: +/-2%; Temp: 0.5 Batteries: 3 * 1.5V LR44 button cell (not included) Temp.: 0.1-60.0; 32.0-140.0F Calibration: pH: three points automatic calibration (6.86 & 4.00 & 9.18pH); TDS: 1413S/cm; EC: 1413S/cm Auto shut off: 5 Minutes TDS/PH/Temperature Meter 3 in 1 Measuring range: pH:0.00-14.00 pH; TDS: 0-19990ppm Resolution: 0.01 pH; 1ppm; 0.1; 0.1F Accuracy: pH: +/-0.01 pH; TDS: +/-2%; Temp: 0.5 Batteries: 3 * 1.5V LR44 button cell(not included) Temp.: 0.1-60.0; 32.0-140.0F Calibration: pH: three points automatic calibration (6.86 & 4.00 & 9.18pH); TDS: 1413ppm Auto shut off: 5 Minutes PH/EC/Temperature Meter 3-in-1 Measuring range: pH:0.00-14.00 pH; EC: 0-19990S/cm Resolution: 0.01 pH; 1S/cm; 0.1; 0.1F Accuracy: pH: +/-0.01 pH; EC: +/-2%; Temp: 0.5 Batteries: 3 * 1.5V LR44 button cell(not included) Temp.: 0.1-60.0; 32.0-140.0F Calibration: pH: three points automatic calibration (6.86 & 4.00 & 9.18pH); EC: 1413S/cm Auto shut off: 5 Minutes How to Calibrate the PH Meter? Take ph 6.86 standard solution calibration as an example: 1. Press the ON/OFF button to turn on the meter, and then press MODE/CAL button adjust the tester to pH mode; 2. Put the electrode into pH 6.86 standard solution, waiting for the readings to stabilize (usually 5~10 Seconds); 3. Press and hold the MODE/CAL button and release after 6 seconds; 4. Until the readings of pH 6.86 is no longer flashing, the calibration of pH 6.86 is completed; 5. Repeat the above steps if you need to calibrate pH 4.00 or pH 9.18. How to make a standard solution? Take ph 6.86 standard solution as an example: 1. Add the pH 6.86 buffer powder into beaker with 250ml of distilled water; 2. Stir until the powder has completely dissolved, then pH 6.86 standard solution is completed; 3. Repeat the above steps if you need to make other standard solutions. How to use the pH meter? 1. Press the ON/OFF button to turn on the unit, and then press MODE/CAL button adjust the tester to pH mode; 2. Dip the electrode in the target solution, making sure the whole electrode is submerged; 3. Wait a few seconds for the reading to stabilize, and the LCD screen will display both temperature and PH value. 4. Dry the electrode with a cloth after use.