Approximately how long can the hygrothermometer's batteries last with continuous reading?

The lifespan of a hygrothermometer's batteries with continuous reading is approximately 300 days. This duration reflects the design and efficiency of the device's power consumption. Hygrothermometers are engineered to provide accurate humidity and temperature readings while balancing battery life.

The selection of 300 days as the correct answer emphasizes the importance of ensuring that equipment used in aircrew flight operations maintains reliable functionality over extended periods without frequent battery replacements. This capability is essential in aviation, where consistent environmental monitoring is critical for safety and operational efficiency.

Understanding the power management of such devices can help aircrew members plan for equipment maintenance and downtime, ensuring readiness while minimizing disruptions caused by battery replacements.