INTELLIGENT PH METER Model : YK-2001PH * pH Meter with mV and '' plug and play '' function. * pH(0.00 to 14.00 pH), mV(1999 mV). * Manual temp. compensation adj. or ATC via the optional temp. probe(YK-200PATC). * Be plugged with optional '' plug & play '' probes : YK-200PCT, YK-200PCD, YK-200PDO, to be a professional Conductivity Meter, TDS Meter, Dissolved Oxygen Meter. * RS-232, Hold, Memory record, oC/oF, 0.1 degree. * Patented. PH electrodes : PE-03, PE-11, PE-01, PE-04HD, PE-06HD.