Hanna Instruments HI 4211 - Manual (Page 71)

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HI 2031B
Glass-body, semimicro, conic, refillable, combination pH electrode.
Use: semisolid products.
HI 1332B
Plastic-body (Ultem
® ), double junction, refillable, combination pH electrode.
Use: general purpose.
HI 1413B
Glass-body, single junction, flat tip, Viscolene, non-refillable, combination pH electrode.
Use: surface measurement.
FC 100B
Plastic-body (Kynar
® ), double junction, refillable, combination pH electrode.
Use: general purpose for food industry.