It's very similar to GLM15, which has a PDF manual stating:
Changing the Unit of Measure
The unit of measure can be changed any time for display of the measured value, even for already measured or calculated values.
Switch off the measuring tool. Press the measuring button 1 and hold it down. The display will alternately show both units of measure. When the desired setting is displayed, release the measuring button 1. The setting is saved.
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Thank you!