1. first i check the basic functionality of the marker
    this is marker is written r not
2. boundary Value Ana
      marker lib present in correct position or not
2a. check whether the marker cap diameter 
2b. check whether the marker open or not
3. check whether  Marker outer color as per the req
4. check whether  Marker inner color as per the req
5. check whether the marker height as per the req
6. check whether the marker width as per the req
7. check whether the stress of the marker 
8. check whether the look as per the req

1. check the physical dimensions.
2. Check the logo and name of the company.
3. Check the colour of the marker.
4. Check that marker should open and close properly.
5. Check the grip.
6. Check that ink properly filled in it or not.
7. Check that it is working(writting) properly or not.
8. Check how much marker write.
9. Check it on different types of paper and other things.
10.Check the colour of ink.

To touch up to the helpful hints provided by the gentlemen,
one should also check whether the marker is "easily
erasable" or not.

Functionality
1. The Marker should be able to write.
2. The marker should be re-usable, you can refill it with 
ink.

User Interface
3. The tip of the marker should be easily visible, so that 
one can easily identify the position to hold it in while 
writing.
4. The Marker has a bar code which is a unique item code 
for it.
5. The Marker has the name of the comapny which has 
manufactured it.
6. The body color of the marker should suggest the color of 
ink of the marker.
7. The color of the marker should be plesant to the eye.

Usability
8. The effort required to use the marker should be minimal, 
i.e. one should not has to stress to write something with 
it.
9. The Marker should be light to hold, so as easy to use.
10. The Marker can be used to write text, make figures, 
color a portion of desired object.
11. The marker should exhibit smoothness while use.
12. The tip of the marker should be round and not flat, 
this would prevent putting stress.
13. The marker's circumference should be wide enough to 
hold, neither too wide nor too thin.

Performance
14. The tip of the marker should be made of a material, so 
that the efficiency of using ink for writing should be high.
15. The life of the marker should be optimum.

Security
16. The marker should have a cap to protect its ink from 
drying up, when not in use.

Integration
17. The marker should be made of a plastic body which 
incloses, a cushion soaked with ink, a tip to write and a 
cap to cover it.

Compatability
18. The Marker should be able to write on paper as well as 
whiteboard.

Negative
19. The marker should not break if dropped.
20. The marker stops to work if used on a rough surface for 
some time.
21. The marker can be used to hit someone.