Clarification: I only just realized the tab with the circuit, steel plate, and gear was called "Intermediate Products." (I'm still a fairly new player)

Here's a third option:

3. Change tool tip to say something like "Usable only on recipes in the Intermediate Products tab and Research . Does not ...

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(Current tool-tip text as of 2.0.76)

Problem:

To my knowledge, in the base game (not sure about Space Age) productivity Modules can be placed in all buildings that accept modules except for beacons, not just "intermediate" products. There are ...