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Use a tread depth indicator or gauge. You can use a special tread depth indicator or gauge tool to measure your tire's tread. If you don't already own one, the gauge is cheap to purchase from an auto parts dealer and it's easy to use. You may be able to find a downloadable tread depth gauge by searching online.
Tread depth can be checked accurately with an inexpensive tyre depth gauge. If you don't have one, measuring somethin to 1mm and using it as a makeshift gauge is not rocket science. Some coins are OK.. measure first That tread depth must be evenly distributed around the tyre pattern. If the depth is OK around the walls but below in the centre, that is a fail. Some sport bikes with a rounder profile tyre wear quicker in the middle than the walls depending on riding style.