How to Use a Breath Alcohol Tester Correctly: Step-by-Step Guide

A breath alcohol tester gives a reliable reading only when it is used the right way. Small mistakes, like testing right after a drink or not blowing long enough, can give a wrong result. Follow these steps every time.

Before you test

• Wait at least 15–20 minutes after drinking, eating, smoking or using mouthwash. Alcohol left in the mouth can give a falsely high reading.
• Use the tester at normal room temperature. Very hot or cold places can affect the sensor.
• Make sure the battery is charged and the mouthpiece is clean and fitted properly.

Step-by-step testing

1. Switch on the tester and wait for the warm-up or “ready” signal.
2. Take a normal deep breath.
3. Blow steadily into the mouthpiece (or towards the sensor for non-contact models) for the time shown in the manual, usually about 4–5 seconds.
4. Stop when the tester beeps or shows the result.
5. Read the result on the display and note it down, or print it if your tester has a printer.
6. Wait for the tester to clear before the next person tests.

Common mistakes to avoid

• Blowing too softly or for too short a time.
• Testing immediately after a drink.
• Sharing one mouthpiece between people. Use a new mouthpiece for each person, or a non-contact alcohol tester.
• Keeping the tester in a hot car or a dusty place.

How often should you calibrate?

Every sensor slowly drifts with use. As a simple rule, get your tester checked and calibrated as per the manual, or sooner if you test many people every day. Fuel cell testers such as the SIMMANS S-75 stay accurate longer between calibrations than semiconductor testers.

Need a tester for daily use? See our digital alcohol testers or call 9211038359 for help.