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ORP METER(Oxidize reduction potential meter)
  Model  Item
ORP-213 ORP-213 Pen type ORP meter, incl. ORP-14 probe
ORP-14 ORP-14 ORP ELECTRODE
ORP-203 ORP-203 ORP METER 
ORP-04 ORP-04 ORP ELECTRODE 
YK-23RP YK-23RP ORP METER, -1999 mV to + 1999 mV, Large LCD, Hold
NI-214 NI-214 NEGATIVE ION WATER TESTER