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pH Meters
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 | A pH Measurement & Control System for the Planted Aquarium - http://www.66pacific.com/ph/ph_1.htm - Hits: 620 People all over the world — many without a lot of electronics experience — have built this aquarium pH measurement and control circuit both cheaply and easily. - [Details] |
 | You can build a simple pH meter with just an inexpensive operational amplifier ("op amp") IC (a TL082 Dual JFET-input IC, about $2.00), 2 batteries, a digital volt meter, and a pH probe. - [Details] |