Colorimeters for display monitors are relatively cheap and easy to use these days.
I recently bought an Xrite ColorMunki Display new off eBay and paid US$180 incl shipping. This sort of colorimeter/software bundle will do what you want. It'll help calibrating the display to a defined standard response (such as D65, gamma 2.2) and also create a profile for it so colour management aware imaging software can compensate for the characteristics of your display.
Cheers
Steffen.
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