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User-replaceable dissolved oxygen sensor for the YSI 550A and 556 multiparameter handhelds. Swap in a fresh sensor in the field in minutes, without sending the instrument in for service or replacing the whole cable assembly. Uses a convenient screw-on membrane cap for simple membrane changes. Used with: YSI 550A and 556 One-year sensor warranty. 556 Manual | 556 Spec Sheet
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🇺🇸 Ship from USA · On Agora since 2026
$301.00