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Combination pH and ORP sensor for the YSI 556 handheld, user-replaceable without tools. Used with: YSI 556 One-year sensor warranty. Requires pH and ORP (Zobell/Dobell) buffer solutions for calibration. 556 Manual | 556 Spec Sheet
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🇺🇸 Ship from USA · On Agora since 2026
$561.00