How to test a whiteboard? 如何测试一个白板

1. if it is white

2. if it could be erased

3. if it could be written with a marked pen

4. how many letters could I write

5. is that clear to show the character

6. how much pressure do I need to write a word

7. how much pressure do I need to erase a word

8. if the marker pen is the only one which could write stuff on it, how about pencil

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