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Registered Mechanic (MR) licence: weights and measures, not cars

Last reviewed: August 14, 2026VerifiedDACO

In short

First, because the name confuses many people: the Registered Mechanic licence DACO issues is not for car mechanics. It belongs to the Weights and Measures Division, and it is for someone who repairs weighing and measuring instruments — the butcher’s scale, the fuel pump. The application asks for your training and experience, which instruments you can repair, what tools and verification equipment you own, and two references other than your current employer who can speak to your skills as a mechanic of weighing and measuring instruments. It costs $75.00 by cheque or money order payable to the Secretary of the Treasury. And watch the clock: the licence expires in a year, renewal is filed fifteen days beforehand, and thirty days after expiry it can no longer be renewed — you must start a new process.

External link

Go to the official site

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www.daco.pr.gov

What is it?

It is the licence the Department of Consumer Affairs issues, through its Weights and Measures Division, to the person who repairs and certifies weighing and measuring instruments. The application makes it clear in what it asks: the instruments you can repair and the services you will offer, the tools and verification equipment you own, and references about your skills as a mechanic of weighing and measuring instruments. On signing, the applicant undertakes not to remove the rejection seal and not to issue a Service Report unless the instrument complies with every applicable legal requirement. DACO’s Secretary may cancel the credential for just cause after considering the circumstances, and if cancelled the credential and the repair seals must be returned.

Who can do it?

The application collects the applicant’s name, phone, residential and postal address, the company represented, training and experience, the instruments they can repair and the services they will offer, the tools and verification equipment they own, and the name, address and phone of two people other than their current employer who can give references about their skills as a mechanic of weighing and measuring instruments. DACO does not publish a formal education requirement or an examination on the form, so this guide does not assert any: what the form assesses is documented experience, equipment and references.

Requirements

Documents you need

Cost

Seventy-five dollars ($75.00), by cheque or money order payable to the Secretary of the Treasury. If the licence is allowed to lapse or the renewal is not filed fifteen days before expiry, a thirty-dollar ($30) penalty also applies.

Verified against the official source · August 14, 2026

Step by step

  1. Step 1: Confirm this is the licence you want

    If you came here looking for how to be licensed as a car mechanic, this is not it. DACO’s Registered Mechanic belongs to the Weights and Measures Division and repairs weighing and measuring instruments: scales, pumps, commercial measuring equipment. The form itself asks you to describe the instruments you can repair.

  2. Step 2: Write out the experience and equipment in detail

    Three boxes carry the application: training and experience; instruments you can repair and services you will offer; and tools and verification equipment you own. That last one is the one people underestimate: DACO wants to know what you will verify with, not only what you will repair with.

  3. Step 3: Get two references who are not your boss

    The form says it expressly: two people other than your current employer, with name, address and phone, able to give references about your skills as a mechanic of weighing and measuring instruments. Tell them before you list them.

  4. Step 4: Gather the four documents

    Two 2x2 photographs, the Negative Criminal Record Certificate, the ASUME Certificate, and the cheque or money order for $75.00 payable to the Secretary of the Treasury. The postal address the form prints is Apartado 41059, Estación Minillas, San Juan, Puerto Rico 00940-1059.

  5. Step 5: Note the expiry date the same day

    Every licence expires one year from grant, and the renewal must be filed fifteen days before expiry. If you miss that window, or let the licence lapse, there is a thirty-dollar penalty. And thirty days after expiry, any renewal application is rejected outright: you must start a new licence application. Set the reminder at eleven months, not twelve.

Where to do it

Before DACO, Weights and Measures Division. The postal address printed on the form is Apartado 41059, Estación Minillas, San Juan, Puerto Rico 00940-1059. DACO’s main line is 787-722-7555, and the Licences extension in San Juan is 14007. The Weights and Measures Laboratory is at 1045 Calle Federico Costa, Urb. Tres Monjitas, Hato Rey, extension 14664.

How long it takes

Check the current processing time with the official agency.

What to do if something goes wrong

If what you want is to be licensed as a car mechanic, this licence is not that: DACO’s belongs to the Weights and Measures Division and is for weighing and measuring instruments. If your licence expired less than thirty days ago, you can still renew but with the thirty-dollar penalty; if more than thirty days have passed, the renewal is rejected outright and a new application must be filed. DACO publishes a renewal form distinct from the new application, so use the right one. If your credential is cancelled, the form warns the Secretary may do so for just cause after considering the circumstances, and that the credential and repair seals must be returned. This guide states no processing time, and no examination or education requirement, because the form does not publish them. PRFácil does not process licences and does not certify instruments.

Common mistakes

  • Confusing it with a car mechanic licence: it is weights and measures.
  • Waiting for the licence to expire to renew, when the application goes in fifteen days before.
  • Letting thirty days pass from expiry and losing the right to renew.
  • Listing the current employer as a reference, which the form expressly excludes.
  • Describing only the repair tools and omitting the verification equipment.
  • Using the new application form for a renewal, or the other way round.

Frequently asked questions

Is it the licence for car mechanics?

No. It is issued by DACO’s Weights and Measures Division and is for someone who repairs weighing and measuring instruments. The form asks you to describe the instruments you can repair and the tools and verification equipment you own, and the references are about your skills as a mechanic of weighing and measuring instruments.

How long does it last and when is it renewed?

Every licence expires one year from grant, and the renewal must be filed fifteen days before the expiry date. Failing to do so, or letting the licence lapse, carries a thirty-dollar penalty. Thirty days after expiry, any renewal is rejected outright and a new application process must be started.

How much does it cost?

Seventy-five dollars, by cheque or money order payable to the Secretary of the Treasury, plus the thirty-dollar penalty if it applies for a late renewal.

Official sources

These are the government pages this guide is based on.

Last verified

August 14, 2026

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