Product Review

Specification:

Measuring range: 0.00-14.00PH
Resolution: 0.01 pH
Accuracy: ± 0.1 pH
Operating Temperature: 0-80
Dimension: 153mm x 29mm x 16mm
Life expectancy: about 500 hours
Relative humidity <95%
Digital pH meter with two key: On and off switch + Auto Calibration button
Auto- One Touch Automatic Calibration; CAL - Calibration button

Feature:

Large digital display makes it easy to read
Pocket sized, handheld pH meter is lightweight, compact, conveniently fits in your pocket or bag and goes anywhere
High accuracy ± 0.1 pH
With automatic temperature compensation (ATC) feature
Easy to set up with the solutions provided,Batteries to power the instrument is included
Very uesful tool, necessary for home, aquarium, fishing industry, swimming pool, school laboratory, food and drinks, etc.

More troubleshooting steps:

If Tester does not stay calibrated. Tests are erratic despite using same samples. Because the accuracy of PH is 0.01, the glass electrode is more sensitive to changes in the surrounding environment So reading jump is normal in the air or water You could please place the ph meter into the water, standing for 2 minus.
The ph meter will slowly become stable3.Even After couple of tries if its stuck at 0 no matter how many times you reset it, then Please take off the battery and then try again.