How to mark instructions, batches, and dates on plastic enclosures   Urine test boards are widely used in medical applications. Urine test boards are mainly used in pregnancy test sticks and drug testing. The plastic shell of the urine test board is often marked with important content such as instructions, batches, and dates. How to ensure that the important content does not fall off for a long time reflects an important basis for the quality of the urine test board.