Which of the following is NOT a factor to measure during calibration?

Tank temperature is not a factor that directly affects the calibration of a spraying system in landscape maintenance. Calibration typically focuses on ensuring that the equipment applies the correct amount of product efficiently and effectively, which involves factors like how wide the spray swath is, how fast the equipment is moving, and what the output rate is during the application process.

Swath width influences how much area is covered with each pass, while travel speed affects the volume of solution being applied per given area. The output rate is crucial as it determines how much product is dispensed over time, directly impacting application rates and efficacy.

In contrast, tank temperature does not have a significant impact on the calibration process itself. While temperature can affect the viscosity and behavior of some chemicals, it is not typically a measurement taken during the calibration of application equipment. Therefore, it is not considered a primary factor in evaluating how well the spraying system is set up for optimal performance.