I've ran the cod from learn robolink ultrasonic sensor and the output from from the serial monitor is posted below

During the output my hand moving away and towards the sensor with no effect. I also noticed that output is slow so I've included the timestamps.

Is there anyway to test if the ultrasonic sensor is defective? How can I test is the board is behaving correctly?

None of the other tutorials in the Programming and Mouse section from learn.robolink.com have had any issues.

Wiring shown below matches the link.