seizoubangou wo kakuninsimasu.

It is read:

せいぞうばんごう を かくにんします

A breakdown:

• 製造番号 = せいぞうばんごう
• を = pronounced お
• 確認します = かくにんします

In natural writing, it is usually written without spaces:

製造番号を確認します。

製造番号 means something like manufacturing number or serial number.

It is made of:

• 製造 = manufacture, production
• 番号 = number

So this refers to the number assigned to a specific product during manufacturing. In real-world English, serial number is often the most natural translation.

を marks the direct object of the verb.

Here, the thing being checked is 製造番号, so 製造番号を means the serial number as the object of 確認します.

So the structure is:

• 製造番号 = serial number
• を = object marker
• 確認します = check / confirm

This is a very common pattern in Japanese: noun + を + verb.

確認します means confirm, check, or verify.

It sounds more careful and deliberate than 見ます, which just means look or see.

So:

• 見ます = look at
• 確認します = check/verify to make sure something is correct

In a sentence like this, 確認します is a very natural choice because the speaker is not just looking at the number—they are checking it for accuracy or identification.

確認する is the plain dictionary form.

確認します is the polite ます-form, which is very common in:

• customer service
• manuals
• instructions
• business situations
• formal spoken Japanese

So 製造番号を確認します sounds polite and neutral.
If you used 確認する, it would sound less polite and more plain.

確認します is the polite non-past form.

In Japanese, the non-past can refer to:

• the present
• the future
• a habitual action

So depending on context, this could mean:

• I am checking the serial number
• I will check the serial number
• We check the serial number

Japanese often leaves the exact time reference to context.

Japanese often omits the subject when it is understood from context.

So in 製造番号を確認します, the subject could be:

• I
• we
• sometimes even an implied you in instructional contexts

For example:

• In customer support, it may mean I will check the serial number
• In a manual or on-screen instruction, it may function like Check the serial number

The listener or reader usually figures this out from the situation.

Yes. Standard Japanese is normally written without spaces between words.

So the normal written form is:

製造番号を確認します。

Spaces are sometimes added in beginner materials to make parsing easier, but they are not usually used in normal Japanese writing.

Although it is written を, it is usually pronounced お in modern Japanese.

So:

• written: 製造番号を確認します
• spoken: せいぞうばんごう お かくにんします

This is normal and something learners just have to get used to.

Yes. If you want to ask someone to check the serial number, 確認してください is more natural.

Compare:

• 製造番号を確認します。 = I/we will check the serial number or a neutral formal statement
• 製造番号を確認してください。 = Please check the serial number

So the original sentence sounds like a statement, while 確認してください sounds like a request or instruction.

This phrase is common in formal or practical contexts, such as:

• instruction manuals
• product registration pages
• repair forms
• customer support conversations
• device setup screens

For example, when registering a product or asking for support, someone may need to check the device’s serial number first, so 製造番号を確認します fits that kind of context very well.