Lutron PH-220 Pen PH Meter

PEN PH METER
Model : PH-220
* Separate pH electrode, easy for general purpose and remote measurements.
* 0 to 14.00 pH.
* Auto calibration for pH 4, pH 7 or pH 10.
* Temp. adjustment is not necessary.
* IP-65 water proof.
* Pen type, easy carry out.
* Complete set with separate pH electrode ( PE-11 ) and pH 4, pH 7 standard solutions.
* Built-in reverse display button.
* DC 1.5V battery ( UM-4, AA ) x 4, long life.