I grew up in Denmark and have a fine-tuned sense for metric measurements (1 mm, 1 cm, and 1 meter). In my small town is more common for craft people (~ "contra

I grew up in Denmark and have a fine-tuned sense for metric measurements (1 mm, 1 cm, and 1 meter). In my small town is more common for craft people (~ "contractors") to compete on who had the more accurate eye measurements. It's truly a sight to behold. TL;DR: any measurement unit can be learned; Metric strength in the simplicity of conversions.