The above shown device is used for:

The above shown device is NST. The nonstress test measures the fetal hea rate in response to fetal movement over time. The term "nonstress" means that during the test, nothing is done to place stress on the fetus. If two or more accelerations occur within a 20-minute period, the result is considered reactive or "reassuring." A reactive result means that for now, it does not appear that there are any problems. A nonreactive result is one in which not enough accelerations are detected in a 40-minute period.