Learn Italian: Il sensore automatico misura non solo la temperatura, ma anche il rumore. - The automatic sensor measures not only the temperature, but also the noise.

Yes, in the non solo ... ma anche structure, ma and anche stay together as a single block right before the second item. You wouldn't separate them by putting the noun in between like you sometimes can in English.

Why does the sentence use rumore instead of suono?

Rumore translates to 'noise' (unwanted, loud, or ambient background sound), which fits what an environmental sensor measures. Suono translates to 'sound' and is usually more neutral or pleasant, like music or a voice.

Is the comma before ma anche required?

Yes, it is standard Italian punctuation. You almost always put a comma before ma (but), even when it is just connecting two nouns rather than two full phrases.

Why does automatico come after sensore?

In Italian, adjectives that categorize something or tell you what specific type of thing it is (like an automatic sensor versus a manual one) almost always go directly after the noun.