pen ph meter model : ph-220 * separate ph electrode, easy for general purpose and remote measurement. * 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 solution. * build in reverse display button. * dc 1.5v battery (um-4, aa) x 4, long life.
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lutron ph-220 pen ph meter
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