When you use a personal breathalyzer to check your condition before driving, you may keep a photo of the screen. If you zoom in on the number alone, it becomes hard to tell later what that value meant. The unit on the screen, the time the result was displayed, and any error message are information that, together with the number, forms the context of the result.
A photo of the test screen is not proof that you are fit to drive. However, it can help you look back on your testing habits, or pass on the information needed for a product inquiry when the device shows an abnormal indication. The reason to include the unit in the photo is not just to preserve the same number, but to avoid misreading that number or comparing it wrongly with other results.
With only the number, the meaning of the result changes
Breath alcohol test screens can use different units, such as %BAC, a way of showing blood alcohol concentration (BAC), per mille ‰, and mg/L, a way of showing breath alcohol concentration (BrAC). The unit is not decoration after the number. It is the basis for reading the result. So if the photo crops out everything but the number, even you will not know later which display format you were looking at.
For example, the official product information for DATECH's AF-40BT lists the display ranges for %BAC, ‰, and mg/L separately. The fact that this product can show three units does not mean every personal breathalyzer provides the same screen or the same features. So when you keep a record of the screen, it is better to photograph the unit actually shown on the screen than to rely on examples from other devices or on memory.
A photo without the unit also causes confusion when you compare it with app records, past results in the device's memory, or separate notes. Even if the numbers look the same, results in different display units cannot be placed side by side on the same basis. The purpose of the photo is not to make the number look bigger, but to let you read the result later exactly as it appeared on the original screen.
A photo needs the minimum information that explains the result
For the original you keep for yourself, you can consider making sure the photo shows not only the result number and unit, but also the date and time on the screen and any error or warning message. The date and time help identify when the test result was displayed, not when the photo was taken. If the screen has no time, or the photo time differs from the test time, it is more accurate to note the two separately in a memo.
| Information to keep | Why it is needed | What to check in the photo |
|---|---|---|
| Result number and unit | To preserve the basis on which the result is shown | %BAC, ‰, or mg/L after the number is not cropped |
| Result time or a separate note | To tell a current test from a past record | The screen time is visible, or the test time is noted separately |
| Error or warning message | To pass on the device status in its original wording | The full message is readable and not altered |
| Product model information | To link the screen to the device during an inquiry | The model is confirmed from the back of the device or a separate note |
If you will send the photo for a product inquiry, model information may also be needed. The AF-40BT offers its own record storage and smartphone connectivity, but a single photo may not show whether the screen is a live test result or a stored history entry. So if you reopened a past result and photographed it, adding a note such as "stored record screen" reduces the chance it is mistaken for a current result.
Separate the purpose of the original from the copy you share
When you send a photo to someone else, there is often no need to pass on the original as is. If the purpose is to ask family or a companion for help getting around, a message saying "I won't drive and will use another way to travel" may be more direct than the full result. On the other hand, if the purpose is to ask about an error on the product screen, a photo showing the unit, error message, and model information is useful.
In a photo for sharing, you can mask content unrelated to the purpose, such as names, account details, other people's records, or unnecessary location clues. However, you must not alter the number, unit, or error message and then pass the image off as the original screen. If you masked part of it, say that it is a masked copy so the recipient does not confuse missing information with the actual result.
Posting self-check results in a group chat or on a public board and leaving the driving decision to others also does not fit the original purpose of the photo. The photo only preserves a personal test result. It does not guarantee when you can drive or what your legal status is. If you hesitate because of the test result or how you feel, the conservative choice is to carry out a backup travel plan set in advance, such as a designated driver service, public transport, or traveling with someone, instead of driving.
What makes a photo complete, in a hypothetical case
Take a hypothetical case. The morning after a company dinner, a driver crops just the number from a personal breathalyzer screen and sends it to family. The family cannot tell the unit, and cannot tell whether the screen is a result just measured or a record stored the day before, so it is hard to make travel plans together.
What to observe in this situation is not a single number but the unit left on the screen, the result time, whether it is a stored record, and any error indication. If the unit was cropped, you can conclude that the basis for displaying the result has been lost. If the time is unknown, you cannot assume the photo shows the current state. If there is an error message on the screen, the priority is to keep that message as well, rather than judging the number in isolation.
A possible action is to photograph the original screen again so the number and unit fit in one frame, and to add a note giving the test time or stating that it is a stored past record. Rather than sending the whole photo again and again, you can tell your family that you plan to use another way to travel instead of driving. Prepare a separate copy showing the model information and error message only when a product inquiry is needed.
In this case, the completion criterion is not "a photo with a sharp number." It is a state in which, looking at it later, you can tell what unit the result was in, when the screen was shown, and whether there was an error, and in which the recipient can understand the purpose of the message without unnecessary personal information.
Photo records are material for reviewing your testing habits
To compare results from the same day, each photo needs to keep its unit and time. That way, instead of remembering only certain numbers, you can review in time order which screen you checked and when. Even if you use app connectivity or the device's storage feature, it is best to treat screen photos as supporting records and not to mix up the time a photo was taken with the test time stored on the device.
A personal breathalyzer is a tool that helps you self-check before driving, and a screen photo is a way to keep the context of that self-check. A photo that includes the unit is not meant to give the number too much weight. It is a basic record that keeps you from downplaying or misreading the result. In the end, the habit of keeping photos is not a habit of letting a number permit you to drive. It is closer to a habit of keeping clearer grounds for choosing another way to travel when you are unsure.
※ 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.
