Imperial/US or Metric
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The default value for the system of measurement is determined the first time you run the application based on your regional settings. Any changes you make to this setting within Trimix Tools will persist for future invocations of Trimix Tools. For example, if you live in Canada but dive with Imperial/US equipment, just change this setting within Trimix Tools and it will stay set until you change it again.
Trimix Tools support multiple windows on iPadOS and macOS so you can leave a window open showing the settings to allow quick changes to the measurement system. The for input editors where it is appropriate (Depth and tank pressure), Trimix Tools allows you to enter values in either system of measurement. For example, if you normal work in Feet but the dive master gives the max planned depth in meters you can enter the value in meters and it will be automatically converted to feet.