A Comparison between Digital and Analog pH Meter Readings
In this article, we will discuss the two types of readouts with pH meters and compare their advantages and disadvantages. The two types of readings are digital and analog. As of today, pH meters have either digital or analog reading.
Digital readings, as far as the data are concerned, are more accurate than the analog. On the other hand, readouts from an analog pH meter give better indications of the rates of change. In a digital reading, the pH is shown directly in numbers.
In an analog pH meter, the numerical data are expressed indirectly expressed by a pointer in a scale. The data are usually expressed in terms of a measured quantity like the position of a pointer controlled by voltages.
Analog pH meters have been used longer and are more common on older instruments. Nonetheless, these analog pH meters have some advantages over digital displays. In contrast to the digital meter, the analog type can show the rate of change aside from the pH value. In an analog type where a pointer is used, the pointer’s speed is easier to interpret than the changing digits.
This is important in the determination of the rate of change. Surprisingly, most scientists would agree that the analog pH meter is also more reliable. With recent advances in electronics, though, manufacturing techniques have addressed this problem and have almost negated this dilemma with the reliability of digital display pH meters.
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