Instrument Directory

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A typical pH meter has two basic components: the meter itself, which can be a moving-coil meter (one with a pointer that moves against a scale) or a digital meter (one with a numeric display), and either one or two probes that you insert into the solution you're testing. If your portable pH meter has two probes, each one is a separate electrode; if you have only one probe, both of the two electrodes are built inside it for simplicity and convenience. The electrodes aren't like normal electrodes (simple pieces of metal wire); each one is a mini chemical set in its own right. The electrode that does the most important job, which is called the glass electrode, has a silver-based electrical wire suspended in a solution of potassium chloride, contained inside a thin bulb (or membrane) made from a special glass containing metal salts (typically compounds of sodium and calcium). The other electrode is called the reference electrode and has a potassium chloride wire suspended in a solution of potassium chloride.

Please select a journal that you would like to view papers from during the time period that you have selected.

Am J Epidemiol

Annu Rev Public Health

Appl Environ Microbiol

Arch Belg

Arch Environ Health

Bratisl Lek Listy

Bull Environ Contam Toxicol

Bull Soc Pathol Exot Filiales

Gig Sanit

Int Arch Occup Environ Health

Minerva Nefrol

Rocz Panstw Zakl Hig

Schriftenr Ver Wasser Boden Lufthyg

Science

Yonsei Med J

Z Gesamte Hyg