Which instrument combination is used to monitor temperature and humidity in a darkroom?

• A. Thermometer and Hygrometer
• B. Barometer and Anemometer
• C. Hygrometer and Compass
• D. Temperature Logger and Humidity Recorder

Answer: (A)

Monitoring temperature and humidity in a darkroom relies on using two basic instruments: a thermometer for temperature and a hygrometer for humidity. The thermometer gives the ambient temperature, which affects film handling, chemical activity, and processing consistency. The hygrometer measures relative humidity, helping prevent issues like static electricity and improper drying that can impact image quality. While other devices exist—barometers for pressure, anemometers for airflow, or compasses for direction—they don’t provide the essential temperature or humidity readings. Modern data loggers can record both values over time, but the straightforward, everyday combo used for immediate monitoring is a thermometer plus a hygrometer.