Lutron PH-224S PH/ORP Meter

\npH, mV, auto Temp. Cal.\npH/ORP METER\nModel : PH-224S\n* Measurement : pH, mV ( ORP ), Temp. ( via ATC Temp. probe )\n* pH : 0 to 14.00 pH\n* mV ( ORP ) : 1,999 mV.\n* Temp. ( via ATC Temp. probe ) : 0 to 65 °C, °C/°F.\n* LCD shows both pH and the temperature.\n* ATC or manual Temp. compensation.\n* Auto calibration for pH 4, pH 7 and pH 10.\n* Hold button, REC button ( Max./Min. button ).\n* Power : DC 9V battery ( 006P ).\n* Optional pH electrode : PE-03, PE-11, PE-02, PE-08, PE-21, PE-06HDA, PE-04HD. PE-03K7\n* Optional ATC probe, TP-07\n* Optional ORP electrode, ORP-14.\n* Optional pH buffer solution : PH-07, PH-04.\n