No, you do not typically need a thermometer specifically for calibrating a pH meter. However, having a thermometer on hand can be helpful for certain calibration procedures, especially if the accuracy of the pH readings is influenced by temperature variations.

When calibrating a pH meter, you usually need calibration solutions of known pH values (e.g., pH 4, pH 7, and pH 10) and follow the manufacturer's instructions for calibration. While temperature can affect pH readings, modern pH meters often come with automatic temperature compensation (ATC) features, which adjust the pH reading based on the temperature of the solution being measured.

If your pH meter has ATC, it will account for temperature differences during calibration and measurement automatically. However, if you suspect temperature variations might affect your readings significantly, you might want to use a separate thermometer to ensure the solution is at the desired temperature before calibration and measurement.