All real things have temperature. Temperature can be measured in various ways. We have reached to a great precision in measuring change in time and space , however I am not sure to what extent change in temperature can be measured? I searched the Internet but found no relevant results.
My question is : With what maximum precision a change in temperature can be measured ? Is there any limit to the measurement of precision in change of temperature ?
PS : I am getting suggestions that my question is probably a duplicate but here is the difference: I am not asking the minimum temperature attainable. I am asking with what maximum precision a change in temperature can be measured. For example - if I take two glasses of water ,or anything suitable ,under same constraints and heat them simultaneously and I stop heating one of the glass few seconds or minutes or hours before the second glass then there will be temperature difference. Now , How sensitive are our measuring instruments to measure the change in temperature? If I heat one glass for 30 minutes and second for 31 minutes or 30.5 minutes then say first glass will show temperature T and other glass will show T plus delta T, now , how fine the delta T can be ?