Psychrometer F is a free iPhone app developed by JUN KANAYAMA that aims to calculate comfort. With this app, users can easily determine the comfortable range by calculating heat, cold, dryness, and moisture. The app features a dial that allows users to easily change values, and the temperature is displayed in color for better understanding.

Using inputs such as temperature and humidity, dew point temperature, or wet-bulb temperature, users can accurately calculate various air conditions. The app provides calculations for drybulb temperature, wetbulb temperature, dew point temperature (frost point), relative humidity, mixing ratio (humidity ratio), absolute humidity, enthalpy, specific volume, atmospheric pressure, vapor pressure, saturated vapor pressure, and temperature-humidity index.

One of the app's convenient features is the ability to automatically enter outside temperature and humidity using weather information, with the user's permission to access location information. Additionally, users can choose from three types of psychrometers: Assmann, Natural, and Sling. The app also allows for easy calculations without a psychrometric chart.

It's important to note that this app does not measure the user's current location value and relies on weather information. While the app provides a wide range of values for input, extreme values may result in errors. The accuracy of the calculation results is not guaranteed, and the developer assumes no responsibility for any damages or losses incurred during use. Overall, Psychrometer F is a practical tool for those seeking comfort calculations.