Method 3
Active area Measurement for Laptop Screen:
It is not a good idea to pull your old lamp out from your laptop screen, measure it
and wait for new lamp to arrive. So we had developed a very effective method by
measuring the active area of screen, horizontally as shown on photo below. Then
you can do that all at once.
Measure the active area width (View Area) from left to right (Horizontally),
Add/Deduct between 1-3mm bases on our part number:
For Example:
If your measurement is 278mm for 13.3 inch laptop screen; you should use
275mm (Our part# MS20275).
If your measurement is 308mm for 15 inch laptop screen, You should used
305mm ( Our Part# MS20305)
The rule of thumb would be always select  a slightly shorter than your original
lamp based on our part number.

Note: This method is only works for Laptop Screen and  base on CCFL is mounted
either on the top or bottom (Horizontally) which is 99% of laptop screen Backlight
lamp are mounted, However, some of 13.3” screen’s Backlight were mounted
vertically, Then you need to measure active area from top to bottom.
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