Buffer amps of this type are called OPERATIONAL AMPLIFIER-types. It comes in a Tube case, which protects instrumentation amplifier from damage during delivery. This particular linear amplifier is a type of Operational Amplifier device, to be precise.
MAX4477AUA/V+ Features
MAX4477AUA/V+ Applications
There are a lot of Maxim Integrated MAX4477AUA/V+ Instrumentational OP Amps applications.