Zincir ölçer zincir baklalarında kullanılır.

Here it is a noun: ölçer means measuring device / gauge / checker.

It comes from the verb ölçmek = to measure. The ending -er / -ar can form a word meaning something that does the action.

So:

• ölçmek = to measure
• ölçer = measurer, meter, gauge

In this sentence, zincir ölçer means chain gauge / chain checker, not he/she/it measures a chain.

Because it belongs to two different parts of the sentence:

• zincir ölçer = chain gauge
• zincir baklalarında = on/in the chain links

So the first zincir tells you what kind of ölçer it is, and the second zincir tells you what kind of baklalar they are.

This repetition is very normal in Turkish. English often avoids repetition more than Turkish does.

baklalarında can be broken down like this:

• bakla = link
• -lar = plural
• -ı = compound/possessive ending
• -n- = buffer consonant
• -da = locative ending, meaning in/on/at

So:

• zincir baklası = chain link
• zincir baklaları = chain links
• zincir baklalarında = on/in the chain links

That -ı is there because zincir baklası is a standard Turkish noun compound.

Because bakla by itself just means link. Turkish often uses a noun compound to say exactly what kind of link:

• bakla = link
• zincir baklası = chain link

So baklalarda would mean on the links in a more general way, while zincir baklalarında specifically means on the chain links.

Also, in Turkish, compounds like this are very common and often more natural than the shorter version.

Because Turkish often uses a different structure for type/category than for true possession.

• zincir baklası = chain link as a general type
• zincirin baklası = the link of the chain, sounding more specifically possessive

Here the sentence is talking generically about chain links as a kind of object, so zincir baklalarında is the more natural choice.

A useful comparison:

• kahve fincanı = coffee cup
• kahvenin fincanı = the cup of the coffee

kullanılır means is used.

It comes from:

• kullanmak = to use
• kullanılmak = to be used
• kullanılır = is used / gets used / is generally used

The form here is a passive plus a general/habitual tense. So the sentence is not about one specific moment; it is stating a general fact.

Because Turkish often uses the passive when the doer is not important or is obvious.

So instead of saying:

• Birisi zincir ölçeri zincir baklalarında kullanır. = Someone uses a chain gauge on the chain links.

Turkish naturally says:

• Zincir ölçer zincir baklalarında kullanılır. = A chain gauge is used on the chain links.

This is very common in explanations, manuals, instructions, and factual descriptions.

Turkish does not have a word exactly like English the, and it does not always need bir for a/an.

In a general statement like this, Turkish usually leaves articles unstated:

• Zincir ölçer ... kullanılır. = A chain gauge ... is used.

If you added bir, it would sound more like a certain one / one chain gauge, which is not necessary here.

So the sentence is naturally generic.

Literally, -da / -de is the locative ending, which can correspond to in, on, at depending on context.

So baklalarında could be understood as in/on the chain links, but in natural English you would probably say on the chain links or sometimes with the chain links, depending on the exact context.

This is normal: Turkish case endings do not always match one single English preposition.

It can be changed.

The sentence as written is perfectly fine:

• Zincir ölçer zincir baklalarında kullanılır.

But Turkish word order is flexible, especially when the meaning is already clear from endings. For example, you could also say:

• Zincir baklalarında zincir ölçer kullanılır.

That version puts more focus on where it is used.

In many neutral statements, Turkish often places the most important or new information near the end, but both versions are grammatical.