Learn Finnish: Uusi laitteisto on tehtaassa. - The new equipment is in the factory.

The root word is laite, meaning "device" or "machine". Adding the collective suffix -sto creates laitteisto, which refers to a collection of devices working together as a system (translated here as "equipment"). Notice that the root changes to the stem laittei- before the suffix is added.

What is the difference between using laitteisto and the regular plural laitteet?

Laitteet simply means multiple individual "devices". Laitteisto, on the other hand, is a singular noun that emphasizes that those devices form a complete, unified setup or hardware system.

Why is the adjective uusi in the singular form when "equipment" implies multiple things?

Even though it describes a collection of things, a word formed with -sto or -stö is a grammatically singular noun. Because laitteisto is singular, the adjective modifying it must also be in the singular form (uusi), rather than the plural (uudet).

What is the dictionary form of tehtaassa and why does the word change so much?