Hanna Instruments HI 2550 - Manual (Page 60)

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FC 100B
Plastic-body (PVDF), double junction, refillable, combination pH electrode.
Use: general purpose for food industry.
FC 200B
Plastic-body (PVDF), open junction, conic, Viscolene, non-refillable,
combination pH electrode. Use: meat & cheese.
FC 210B
Glass-body, double junction, conic, Viscolene, non-refillable, combination
pH electrode. Use: milk, yogurt.
FC 220B
Glass-body, triple-ceramic, single junction, refillable, combination pH
electrode. Use: food processing.
FC 911B
Plastic-body (PVDF), double junction, refillable with built-in amplifier,
combination pH electrode. Use: very high humidity.