In version 62 of Spark AR Studio onwards, the default unit of measurement in is meters.
You'll still be able to open projects created using other units of measurements, and continue work on them. Features that can be shared with other creators might not be available, so it's a good idea to change the units to meters.
You can easily convert Spark AR Studio projects that have been built using other units. To do this:
You'll still need to update any scripts or patches that use other units.