Final answer:
Machine observers use a variety of devices to record behavior, such as website counters and Nielsen PeopleMeter. These devices are part of technology-based research tools used in sociology. Other measurement devices are also used to collect data in a numerical format.
Step-by-step explanation:
Machine observers use a variety of devices to record behavior. One such device is website counters, which are used to track the number of visits a website receives. Another device is Nielsen PeopleMeter, which is used to identify what family members are watching on television. These devices are examples of technology-based research tools used in the field of sociology.
Additionally, there are other measurement devices used in machine observation, although the question does not provide specific details about them. These devices are designed to collect data in a numerical format, which can be counted and analyzed using statistical methods.