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Metric units and Celsius
Yardstick starts out in feet, inches and Fahrenheit. Meters, centimeters and Celsius are all there: the choices in Settings → Display switch the map and the map editor, and one setting switches the weather panel.
Meters and centimeters
Open Settings → Display. Under Units, choose Meters. Distances and areas switch to meters and square meters. Choose Feet to switch back.
The map editor follows it
The map editor has no units switch of its own. It uses whatever the Units choice in Settings → Display is set to. Set that to meters, then open the map editor, or reload it if it was already open.
Zone size grows and shrinks by 1 cm
With a zone selected, the Zone size buttons read − 1 cm and + 1 cm instead of 1 inch.
Sizes are shown in meters
The zone's area is in square meters, and its width and length in meters.
Celsius
In Display
Open Settings → Display → Temperature and choose °C. (The screenshot shows the classic Temp button under the map.)
In the weather panel
The weather panel has its own setting. Open Settings, find Weather, and under Units choose Celsius. That gives you °C, km/h and mm. Press Save.