A personal breathalyzer is a device you blow into to check an alcohol test result. When people use one for the first time, or take it out after a long while, they often look for the manual through a QR code printed on the box or the device. A QR code is only a picture code that quickly opens a web page or file. It is no guarantee that the code always leads to a page run by the manufacturer.
The manual is the material for checking test preparation and what the display means, so if you get a document for another model or open a file of unclear origin, you may miss guidance you need. After scanning a QR code, it is safer to compare, in order, whether the address, the page, and the file you will download actually lead to the official information for your product.
First look at where the QR code is placed
A code printed directly on the device, a printed instruction sheet inside the product box, and a code in an image posted on a sales page all start from different places. On physical printed material in particular, check whether another sticker has been placed over the original code. A clean appearance does not confirm the source, but if there are signs that something was stuck on top, there is no reason to trust that code as the path to the manual.
A photo you received from someone you know, or a QR code forwarded by messenger, makes it hard to tell whether the code came with the product. If you cannot tell which model's instruction sheet, and from what time, the code in a photo came from, it is better to look up the official website directly by the manufacturer's name than to scan it. It is best not to treat the goal of opening the manual quickly and the goal of confirming a safe path as separate things.
On the scan screen, read the address first
When you read a QR code with a phone camera, the destination address is usually shown before it opens. Do not just check whether the brand name appears somewhere in the address. Look at the spelling and the ending of the actual web address as well, because some addresses change one letter or the order of letters in a familiar name.
If the destination cannot be seen right away, as with a short link, you do not have to open it. If you find the same manual in the support, downloads, or similar menu on the manufacturer's official website, you can confirm where the document comes from independently of the path the QR code pointed to. Ads on a search results page or attachments re-uploaded by others are hard to assume are the same material as the official download list.
| Order of checks | What to look at on screen or in the document | Next step if it does not match |
|---|---|---|
| Before reading the QR code | Whether there is a sticker over the code or instructions of unknown origin | Do not scan it; find the official website directly |
| Before opening the address | Whether it is the manufacturer's official address with natural spelling and ending | Close it and find the material in the support menu |
| Before downloading the file | Whether an official post links to that file | Do not download it; compare the post and model name again |
| After opening the document | Whether the model name on the device, the language, and the document title match | Do not use that document; find the right material |
On the official page, check how the file is linked
The Downloads section of an official website is not just a place to look at files. It is the reference point for confirming which documents the manufacturer provides for which products. Compare the post title and document title in the download list side by side with the model name written on the device or packaging. Even if model names are similar, a product with different buttons, display, or connectivity features may have a different manual.
Because official posts sometimes link to files in external storage, you cannot conclude a file is fake just because its address differs from the manufacturer's website. However, you must be able to confirm the link from the manufacturer's official post to that file. Conversely, if all you have is a file someone sent and you cannot find the same material in an official post, it is better not to adopt it as the user manual, even if the file name contains the product name or the word "manual."
Separate unexpected requests from the manual
If you want to view the manual but a screen first asks for an account password, payment details, or personal information, stop. Whether such information is needed just to read a document, and whether the request appears in the manufacturer's official guidance, are separate questions. Rather than tapping a phone number or customer center button shown on a suspicious page, it is clearer to use the contact details and support menu on the manufacturer's official website that you already know.
If an app installation screen appears through the QR code, also look at it separately from viewing the document. Rather than downloading an app directly from the QR code, it is appropriate to confirm in the product's official guidance whether the app is really needed, and then look up the app name and provider in your phone's official app store. Installing an app to view a PDF manual and installing an app needed for breathalyzer features are not the same request.
Set the order of checks with a hypothetical case
Let's assume a case. Someone who wants to recheck how to use their breathalyzer before work reads the QR code on the side of the box, and a page with an unfamiliar address opens with a message asking them to log in to view the document. The only observable facts are "the QR code opened a page" and "it asks for a login," and these two facts alone cannot be interpreted as an official manual.
A possible action here is to close the page without entering any information, and then find the support or download menu on the manufacturer's official website. There, find the Korean-language manual post whose title matches the device's model name, and compare it all the way to the title of the file the post links to. The completion criterion is not having opened the QR page, but a state in which you have confirmed that an official post leads to a document for the model you have, and the model name and language inside the document also match.
Even after finding the right manual, keep its use narrow
Use the confirmed manual to understand the operating sequence and screen displays of that breathalyzer. However, the fact that the manual is correct, or a personal test result, does not by itself guarantee driving safety. Treat a personal breathalyzer as a reference tool for checking your own condition, and keep a conservative attitude of not deciding lightly whether to drive based on a reading alone.
The habit of checking a manual's source is not a complicated security procedure. It means following the order of looking at the physical condition of the code, reading the address before opening it, and comparing the official post, the file, and the model name. If you follow this order, you can find the product information you need again through the official path rather than following the requests of an unfamiliar link.
※ Self-check results from our products are provided as reference information only. Actual enforcement standards and testing methods may differ by agency and equipment, so self-check results may differ from enforcement results, and the company accepts no responsibility for enforcement results.
