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HI 1131B
Glass-body, single junction, refillable, combination pH electrode.
Use: general purpose.
HI 1330B
Glass-body, semimicro, single junction, refillable, combination pH electrode.
Use: laboratory, vials.
HI 1331B
Glass-body, semimicro, single junction, refillable, combination pH electrode.
Use: flasks.
HI 1230B
Plastic-body (PEI
®
), double junction, gel-filled, combination pH electrode.
Use: general, field.