Which instrument is used for measuring pH and temperature?

• A. DPD Kit.
• B. pH pen.
• C. Bacon Bomb.
• D. Dippers.

Answer: (B)

Measuring pH and temperature on-site relies on a device that combines a pH sensor with a temperature sensor. A pH pen does exactly this, giving a direct readout of the water’s acidity (pH) and a temperature reading. Temperature matters because pH readings shift with temperature, so many pH pens offer automatic temperature compensation to adjust the pH value to a standard reference temperature, making results more reliable for decisions in water surveillance and treatment. For accuracy, you typically calibrate the pen with standard buffer solutions before use.

The other items serve different roles: a DPD kit measures chlorine residual via a color change, not pH or temperature; dippers are used to collect samples rather than measure pH or temperature; and a Bacon Bomb isn’t a measurement instrument at all.