Step 1: Device for checking blood pressure.
A \textit{Sphygmomanometer} is used to measure blood pressure.
Step 2: Device for checking blood sugar.
A \textit{Glucometer} is used to measure blood sugar levels, which is the key answer for this question.
Step 3: Conclusion.
Thus, the device for measuring blood sugar is a Glucometer, making option (2) correct.