Der Fachbetrieb macht die Dichtheitsprüfung.

Fachbetrieb means a specialist company, qualified contractor, or professional service company. It suggests a business with the proper training, expertise, and often certification to do a particular kind of work.

It is made from:

• Fach = field, specialty, area of expertise
• Betrieb = business, operation, company

So der Fachbetrieb is not just any company; it is a company that specializes in that kind of work.

Because Betrieb is a masculine noun in German, so its nominative singular article is der.

Here der Fachbetrieb is the subject of the sentence, so it stays in the nominative:

• der Fachbetrieb = the specialist company

If the noun were in another case, the article might change. For example:

• nominative: der Fachbetrieb
• accusative: den Fachbetrieb
• dative: dem Fachbetrieb

Because Prüfung is a feminine noun, and Dichtheitsprüfung takes its gender from the final part of the compound, which is Prüfung.

So:

• die Prüfung = the test / inspection
• therefore die Dichtheitsprüfung is also feminine

In this sentence, die Dichtheitsprüfung is the direct object. For feminine nouns, the article die is the same in both nominative and accusative singular, so it does not change here.

It is a compound noun, which is very common in German.

You can break it down like this:

• dicht = tight, sealed, not leaking
• -heit = a suffix that makes an abstract noun, like -ness in English
• Dichtheit = tightness / leak-tightness
• Prüfung = test, inspection, examination

So Dichtheitsprüfung means something like tightness test, leak test, or inspection for leaks, depending on the context.

The -s- in the middle is a linking sound often found in German compounds:

• Dichtheit + s + Prüfung

Yes, machen often means to make or to do, but in German it is also used in many everyday expressions where English would prefer a more specific verb.

So eine Prüfung machen can mean:

• to do / carry out a test
• in some contexts, to take an exam

In this sentence, macht die Dichtheitsprüfung means carries out or performs the leak-tightness test.

A more formal or technical verb is often:

• durchführen = to carry out, conduct

So Der Fachbetrieb führt die Dichtheitsprüfung durch is also very natural.

Because standard German main clauses usually follow the verb-second rule.

In this sentence:

• Der Fachbetrieb = first element
• macht = second element
• die Dichtheitsprüfung = the rest

So the pattern is:

• Subject + verb + object

This is one of the most basic German sentence patterns.

If you move another element to the front, the verb still stays second:

• Heute macht der Fachbetrieb die Dichtheitsprüfung.

Here Heute is first, and macht is still second.

Yes. It is the direct object of macht, so it is in the accusative.

You can think of it as the thing being done:

• The company does the test

Because Dichtheitsprüfung is feminine, nominative and accusative both use die:

• nominative: die Dichtheitsprüfung
• accusative: die Dichtheitsprüfung

So the form looks the same, even though the grammatical role is different.

Yes, that is also possible, and it is a little more direct.

Compare:

• Der Fachbetrieb macht die Dichtheitsprüfung.
• Der Fachbetrieb prüft die Dichtheit.

The second version uses the verb prüfen = to check / test / inspect.

Both are understandable. The version with Dichtheitsprüfung sounds a bit more like the name of a formal procedure or official inspection.

Yes, macht is the third-person singular present tense of machen.

It can refer to:

• something happening now
• something done regularly
• something planned or scheduled, depending on context

So without more context, macht could mean:

• the company is doing the test
• the company does the test
• the company will do the test

German present tense often covers meanings that English splits between does, is doing, and sometimes even will do.

A good way is to split it into parts:

Dicht-heits-prü-fung

Rough guide:

• Dicht sounds somewhat like dikht with the German ch sound
• heits sounds like hites
• prü has the German ü, which does not exist in standard English
• fung sounds like foong with a short oo

The main stress is usually on the first part of the compound:

• DICHTheitsprüfung

If it helps, practice it in chunks:

1. Dichtheit
2. Prüfung
3. Dichtheitsprüfung

Yes, especially in technical or formal writing.

For example:

• Die Dichtheitsprüfung wird vom Fachbetrieb gemacht.
• Die Dichtheitsprüfung wird vom Fachbetrieb durchgeführt.

This shifts the focus from who does it to the test itself.

In many professional or official contexts, the passive or durchführen version may sound more formal than macht. However, the original sentence is perfectly correct and natural, especially in plain, straightforward language.