1. There is 2-3% difference based on manual measurement. 
2. Please check the measurement chart carefully before purchasing the item. 
1 inch = 2.54 cm
3. Please note that the slight color difference should be acceptable due to the light and the screen.
4. Please contact us first if you have any problems, we will give you a satisfactory solution, please do not feel free to open a return request and leave negative feedback.