build ATC sensor, 0.01 pH resolution PEN pH METER

* 0 to 14.00 pH x 0.01 pH.

* ATC ( auto temperature compensation ).

* Calibration for pH 4, pH 7 or pH 10.

* Meter with pH electrode, all in one.

* IP-67, water proof.

* Easy replacement for the pH electrode.

* Pen type, easy operation carry out.

* pH 4, pH 7 standard solutions are included.

* DC 1.5V battery ( UM-4/AAA ) x 4 PCs.