How to use NH310 colorimeter to measure cups

Look at this cup that is curved surface. 

How shall we use model NH310 colorimeter to measure its color difference? The standard accessory white rubber for NH310 color meter is good for curved surface sample, but light might leak from the aperture if it is not good closed. 

So for this special curved sample like cups, we should use the optional accessory called extended aperture only matched with model NH310 color test equipment to help measure. They closed very well and the test result is good. 

If your sample is small area, please consider this extended aperture to help measurement. 

If you are unsure which instrument type is right for your samples, please call or email 3nh technical support (Melorae Huang sales@3nh.com) and we will be happy to assist you in making the proper instrument selection.