Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
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Tips on calibrating and using a pH meter in photographic work.
DARKROOM & CREATIVE CAMERA TECHNIQUES Sep-Oct 1987 (v.8#5) pg. 23

Tips on using a digital voltmeter as a pH meter.
DARKROOM & CREATIVE CAMERA TECHNIQUES Sep-Oct 1988 (v.9#5) pg. 7

Techniques for the storage, calibration and use of pH meters.
DARKROOM & CREATIVE CAMERA TECHNIQUES Jul-Aug 1989 (v.10#4) pg. 8

Tips on using and rejuvenating a pH meter used with photochemistry.
DARKROOM & CREATIVE CAMERA TECHNIQUES May-Jun 1991 (v.12#3) pg. 17

Acid rain monitor. Electronic pH meter uses a simple 1-transistor circuit. The meter's range is from 7 (neutral) to 2.5 (highly acidic). Includes construction of a rain collector with an automatic drain. Est. cost: $30.
ELECTRONICS EXPERIMENTERS HANDBOOK 1989 pg. 41

Solid-state pH meter measures up to a pH of 14. Est. cost: $26.
POPULAR ELECTRONICS [1] Nov 1968 (v.29#5) pg. 33

Easy-to-build accurate pH meter circuit.
POPULAR ELECTRONICS [2] Sep 1998 (v.15#9) pg. 66
Correction POPULAR ELECTRONICS [2] Dec 1998 (v.15#12) pg. 64

Acid rain monitor. A simple one-transistor circuit can be used to sense the acidity of local rainfall (and other liquids). The sensor can be mounted in a remote location because it has a built-in solenoid-operated drain valve. Measures pH values from 7 (neutral) to 2.5 (highly acidic). Est. cost: $30.
RADIO-ELECTRONICS Apr 1987 (v.58#4) pg. 48

A pH meter for measuring the acidity or alkalinity of solutions.
SCIENTIFIC AMERICAN Sep 1968 (v.219#3) pg. 232

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