ORP METER
Model : ORP-213
* Range : -1,000 mV to 1,000 mV.
* Professional ORP electrode, ORP-14 is included.
* Separate ORP electrode, easy operation.
* High input impedance.
* Data hold.
* Built-in reverse display button.
* IP-65 Water resistance, heavy duty.
* DC 1.5V battery ( UM-4, AA ) x 4, long life.