So what is meant by modular form?

[swty todd]

I don't understand the meaning of the following statement.

SOME INSTRUMENTATION AMPLIFIERS ARE AVAILABLE IN MODULAR FORM TO SUIT SPECIAL INSTALLATION REQUIREMENTS.

In the above statement i don't understand what is meant by modular form.
I know that module means a self-comtained independent unit but i guess all instrumentation amplifiers are self-contained independent units.

 

[mgb_phys]

It probably means the IC, any power supply smoothing caps, temperature compensation etc all included on a PCB - and probably encapsulated in a plastic or metal case.