El contador inteligente mide; en cambio, revisamos la factura.

Here, contador means a meter, especially a utility meter such as an electricity, gas, or water meter.

In Spain, el contador is a very common word for this. In other contexts, contador can also mean accountant in some varieties of Spanish, but in this sentence contador inteligente clearly means smart meter.

In Spanish, adjectives usually come after the noun, so contador inteligente is the normal order.

• el contador inteligente = the smart meter

Putting the adjective before the noun is much less common and often sounds literary, emphatic, or changes the nuance. In ordinary everyday Spanish, contador inteligente is the natural phrasing.

Mide is the third-person singular present form of medir (to measure).

It matches el contador inteligente, which is a singular subject:

• el contador inteligente mide
• the smart meter measures

A quick breakdown:

• yo mido = I measure
• tú mides = you measure
• él/ella mide = he/she/it measures
• nosotros medimos = we measure

So mide is used because the subject is it: the meter.

In Spanish, medir is a very normal verb for what a meter does. A utility meter measures consumption or usage.

So even if English might sometimes think of a meter as recording or registering usage, Spanish commonly uses medir for that idea.

Other verbs are possible in some contexts, such as:

• registrar = to record
• contar = to count

But mide is perfectly natural here.

En cambio means something like by contrast, whereas, or on the other hand.

It introduces a contrast between the two clauses:

• El contador inteligente mide
• en cambio, revisamos la factura

So the idea is that one thing happens on one side, and a contrasting action happens on the other.

It is a stronger, more deliberate contrast marker than a simple but in many cases.

Both can show contrast, but they are not exactly the same.

• pero = but
• en cambio = by contrast / on the other hand

Pero is the more general connector.
En cambio is often used when you want to set up a clearer comparison between two different subjects, actions, or situations.

So:

• El contador inteligente mide, pero revisamos la factura
  = understandable, but less neatly contrastive

• El contador inteligente mide; en cambio, revisamos la factura
  = more explicitly contrasts what the meter does with what we do

The semicolon helps separate two closely related but distinct clauses. It is a neat way to mark a contrast.

Spanish often uses punctuation like this with connectors such as en cambio. You may also see commas in similar sentences, but the semicolon gives a slightly clearer pause and makes the contrast feel more structured.

So this punctuation is natural and stylistically careful.

Spanish often omits subject pronouns because the verb ending already tells you who the subject is.

• revisamos = we review / we check

The ending -amos shows that the subject is nosotros. Because of that, saying nosotros is usually unnecessary unless you want emphasis or contrast.

So:

• revisamos la factura = normal
• nosotros revisamos la factura = more emphatic, like we check the bill

Yes. Revisamos is the present indicative of revisar.

In context, it can mean:

• we review/check the bill
• we are reviewing/checking the bill
  (depending on context, though Spanish often uses the simple present where English might use the present continuous)

It can also sometimes refer to a habitual action:

• we check the bill regularly

So the exact English translation depends on the situation, but grammatically it is the present tense.

La factura uses the definite article because it refers to a specific bill that both speaker and listener can identify from the context.

• la factura = the bill / the invoice
• una factura = a bill / an invoice

In a sentence about a smart meter, la factura naturally suggests the relevant bill, probably the household’s or account’s bill.

Spanish also often uses the definite article where English might sometimes prefer a possessive:

• revisamos la factura
  literally: we check the bill
• natural English meaning: we check our bill

Yes, in Spain contador inteligente is a normal and very recognisable term, especially for electricity or other utilities.

You may also hear medidor inteligente in some places or contexts, especially outside Spain, but for Spanish from Spain, contador inteligente sounds very natural.

Revisar here means to review, to check, or to look over carefully.

So revisamos la factura suggests that we inspect the bill, probably to see charges, usage, or possible mistakes.

It is slightly broader than just look at. It implies checking with some attention.

For comparison:

• mirar la factura = to look at the bill
• revisar la factura = to check/review the bill
• comprobar la factura = to verify the bill

In this sentence, revisamos is a very natural choice.