build atc sensor, economic type pen ph meter model : ph-223 * 0 to 14.00 ph. * atc (auto temperature compensation). * auto calibration for ph 4, ph 7 or ph 10. * meter with ph electrode, all in one. * ip-67, water proof. * easy replacement for the ph electrode. * pen type, easy operation carry out. * ph 4, ph 7 standard solution are included. * dc 1.5v battery (um-4, aa) x 4, long life. * pen type easy carryout.
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lutron ph-223 pen ph meter
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