The instrumentation amplifier in this picture is of the BUFFER-type. We are approaching the 16h termination of the year. This linear amplifier should be powered by an 5V battery. There are two types of Buffer Amplifier op amps in this case, and this device falls into one of them.
MAX4222EEE/GH9 Features
supply voltage of 5V
MAX4222EEE/GH9 Applications
There are a lot of Maxim Integrated MAX4222EEE/GH9 Instrumentational OP Amps applications.