3 in 1 PH Pen (TDS/PH/EC)

Water quality tester simply tests pH, EC, TDS and Temperature in an accurate, quick and reliable manner for most regular water solutions' testing such as hydroponics, pools and spas, wine-making, education, water treatment, cooling towers, etc.

Specification:

Range:pH:0.00~14.00pH
EC:1~19999us/cm
TDS:1~19999ppm
0~60.0?/32.0~140.0?

Resolution:PH:0.01pH
EC:1s/cm
TDS:1ppm

Accuracy: pH:0.05pH
TEMP:0.5?
EC:2% TDS:2%

How to Calibrate the pH Meter

pH6.86:
Power on? Press the MODEL/CAL button ? Adjust to pH mode? Put the electrode into pH6.86 standard solution? Press and hold the MODEL/CAL button for 6 seconds ? The value of pH6.86 is no longer flashing, and the calibration of pH6.86 is completed.
pH4.01
Power on?Press the MODEL/CAL button ? Adjust to pH mode?Put the electrode into pH4.01 standard solution?Press and hold the MODEL/CAL button for 6 seconds?The value of pH4.01 is no longer flashing, and the calibration of pH4.01 is completed.
pH9.18
Power on?Press the MODEL/CAL button ? Adjust to pH mode?Put the electrode into pH9.18 standard solution?Press and hold the MODEL/CAL button for 6 seconds?The value of pH9.18 is no longer flashing, and the calibration of pH9.18 is completed.

How to make a standard solution:
Completely empty the powder into a clean 250ml glass beaker.
Add 250ml of PH Buffer Powder to the beaker.
Still until the powder has completely dissolved.
PH solution accuracy is 0.01PH