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Check the listing for details. 1-Professional Laboratory Electrode Aquarium Hydroponic Laboratory PH YXLS. Condition: New. Listed at 19.59 USD. Great laboratory pH electrode probe. Type: Laboratory Electrode. Type of Electrode Plug: Q9. Electrode Length:14.8cm. Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems.
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