pH Reading draws a pH meter wired to a glass electrode standing in a beaker, or a strip of pH paper above its color chart, showing the pH you type. A digital pH meter shows 1 or 2 decimal places. An analog meter swings a needle over a dial from 0 to 14, marked every 0.2 and read to 0.01, with an optional magnified view of the dial.
The pH paper is universal indicator paper: its wet end turns the color of the reading, and students match it to the chart’s swatch for each whole pH from 0 to 14. Teachers use these figures in acids and bases units, indicator labs, and questions comparing how precisely each instrument reads.
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No. Litmus only tells an acid from a base. Universal indicator paper, which this figure shows, turns a range of colors, so the pH can be read to the whole number from its color chart.
No. Students match the strip’s color to the chart, so print it in color or show it on a slide. The pH meters are read from numbers and a needle, not color.
The dial is numbered every 1 and marked every 0.2. Find the last mark the needle has passed, then estimate where it sits in the next 0.2 and read to 0.01, like 6.47.
The digital meter shows 1 or 2 decimal places, the analog meter is read to 0.01 with the last digit estimated, and pH paper is read to the whole number.
Chemistry Figures pH Reading