Älymittarin lukema on korkea.

Älymittarin is the genitive singular form of älymittari.

In this sentence, the genitive shows a relationship like the smart meter’s reading or the reading of the smart meter.

• älymittari = smart meter
• älymittarin = of the smart meter / the smart meter’s

So:

• Älymittarin lukema = the smart meter’s reading

This is a very common Finnish structure:

• talon ovi = the house’s door / the door of the house
• auton väri = the car’s color

Lukema is in the nominative singular.

It is the main noun of the subject phrase:

• Älymittarin lukema = the smart meter’s reading

In the sentence Älymittarin lukema on korkea, the whole phrase Älymittarin lukema is the subject, and lukema is the head noun of that phrase.

A useful way to see it:

• älymittarin = modifier in the genitive
• lukema = main noun, nominative

Lukema means a reading, measured value, or readout.

In contexts involving meters, gauges, or measurements, lukema is the value shown by the device.

So in this sentence it refers to the number/value shown by the smart meter.

It is related to the verb lukea, which usually means to read, but lukema is a noun meaning something like a reading/result that has been read off.

Korkea literally means high.

In Finnish, just like in English, measurements, levels, prices, temperatures, and readings can be described as high or low.

So:

• lukema on korkea = the reading is high

This is a natural use of korkea for values and levels.

You may also see the opposite:

• Lukema on matala. = The reading is low.

Here korkea is a predicate adjective after the verb on.

In Finnish, predicate adjectives are normally in the nominative when the subject is nominative singular.

So:

• lukema on korkea = the reading is high

Compare:

• lukemat ovat korkeat = the readings are high

So the adjective agrees with the subject in number:

• singular subject → korkea
• plural subject → korkeat

Yes. Finnish uses compound nouns very often, much more than English does.

Älymittari is a compound:

• äly = intelligence, smart
• mittari = meter

Together:

• älymittari = smart meter

This is very typical Finnish word formation. English often writes these as two words, but Finnish usually combines them into one.

Other examples:

• matkapuhelin = mobile phone
• pesukone = washing machine
• sähköauto = electric car

The structure is:

[subject] + [verb] + [predicate adjective]

So:

• Älymittarin lukema = subject
• on = is
• korkea = high

This is a very basic Finnish sentence type, similar to English X is Y.

You can think of it as:

• The smart meter’s reading
  • is
    • high

Yes, Finnish word order is fairly flexible, although the given order is the most neutral and natural here.

Neutral:

• Älymittarin lukema on korkea.

Other orders are possible for emphasis, for example:

• Korkea on älymittarin lukema.

But that sounds more marked or literary. For normal learning and everyday use, the original order is the best one to copy.

Finnish does not have articles like a, an, or the.

So Finnish often leaves that idea to be understood from context.

For example:

• lukema can mean a reading or the reading
• älymittarin lukema can mean the smart meter’s reading

The exact English translation depends on context, but Finnish itself does not add an article word.

Yes. That is a very natural English translation.

The Finnish structure is literally closer to the smart meter’s reading, but English may express the same idea in different ways:

• The smart meter’s reading is high.
• The reading on the smart meter is high.

Both fit the Finnish sentence well, depending on style and context.

Then both the subject noun and the adjective would change to plural.

Singular:

• Älymittarin lukema on korkea. = The smart meter’s reading is high.

Plural:

• Älymittarin lukemat ovat korkeat. = The smart meter’s readings are high.

Notice the changes:

• lukema → lukemat
• on → ovat
• korkea → korkeat

This shows normal subject-verb and adjective agreement in Finnish.

No. They are related, but they mean different things.

• lukema = a reading, a readout, a measured value
• lukeminen = reading, the act of reading

So in this sentence, lukema is correct because we are talking about the value shown by the meter, not the action of reading it.

Compare:

• Mittarin lukema = the meter reading
• Mittarin lukeminen = reading the meter

That is an important difference.

A few helpful points:

• ä is pronounced somewhat like the vowel in cat, but cleaner and shorter
• y is a rounded front vowel; English does not have an exact equivalent
• double letters matter in Finnish, but there are no double vowels or consonants here that change length dramatically except tt in mittarin, which is pronounced clearly as a long consonant in the base word mittari
• stress is always on the first syllable of each word

Rough syllable breakdown:

• ä-ly-mit-ta-rin
• lu-ke-ma
• on
• kor-ke-a

A rough learner-friendly approximation might be:

• AE-lü-mit-ta-rin LU-ke-ma on KOR-ke-a

But it is best to listen to native audio if possible, especially for ä and y.