Why taking the temperature of melting ice using data logger and laboratory thermometer different?

Answer 1

Its essentially the same thing, temperatures are being recorded with time. The data logger automatically takes the temperature readings at a given time step, and the data can then be uploaded easily and manipulated. More readings can be taken at smaller increments, and over long periods of time without the need for constant observation. Taking the readings manually with a thermometer may introduce more human error, and will generally take more effort and concentration. Either method is good though, though there are some disadvantages and advantages to both.

Answer 2

The difference in temperature readings between a data logger and a laboratory thermometer when measuring the melting ice could be due to factors such as calibration differences, response time variability, or placement within the ice. Data loggers may have varying accuracies or delays in detecting temperature changes compared to laboratory thermometers, leading to discrepancies in the measurements recorded.