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Xiuer and I tested it. How does David make a whiteboard presentation?

Improper use and poor quality.

1, improper use, you need to follow the instructions when using David's pregnancy test stick. If the operation is improper, such as the test paper is inserted into the urine too deeply or soaked for too long, the result will be inaccurate.

2, the quality is not good, if you buy a poor or fake pregnancy test stick, its test results are not accurate, so there will be a whiteboard. Buy pregnancy test sticks from regular channels.