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sorry for the unclear question. As the dimensions of the button is very small, my standard ruler could not measure out the minute change in dimensions, to accurately calculate the length. I need the accurate dimensions so I can purchase the same button on the internet. So basically, I need a way to find out which button should I purchase online that will fit into my mouse.
Then use a caliper gauge. If you don't have one, ask your neighbour or a mechanic.
You may also do a google search for pictures. From the pictures (and the informations on their internet sites) you may find out manufacturer and type. Then look for the datasheets and compare the informations with your switch.
I recognize a square tactile switch with two through-hole pins. Important parameters are button height above PCB and pin distance. A popular form factor is 6.5 mm pin distance and 4.3 or 5 mm height. Square case is unusual for two pin, thus yours may have different dimensions.
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I see another popular form factor, 6x6 mm square case with two pins, 5 mm distance. Made by Omron and others. Many different button heights available.