Before consuming alcohol, read and ensure you understand the ‘Instructions’ and ‘Interpretation of Results’, and the products’ ‘Disclaimer’. They’re on the leaflet inside the product’s packaging, and on the unit’s breath bag. Do NOT carry out a Redline test within 20 minutes of your last drink of alcohol (or use of a mouthwash, gargle or other product containing alcohol). Use a tester within 5 minutes of opening the tube (i.e. snapping off the end caps). Ensure that you evaluate the results UNDER GOOD LIGHTING CONDITIONS. STEP ONE Snap off the ends of the red and white caps at the end of the tester tube, and then shake out and discard the small amount of white crystals that are loosely contained within the tube. These white crystals are harmless silica gel, used to keep the yellow active chemical crystals dry. STEP TWO Using ONE continuous breath, fully inflate the bag. More than one breath will deliver an inaccurate result. STEP THREE Insert the WHITE cap end of the tester into the WHITE neck of the fully inflated bag. Alternatively, note that there’s a red arrow on the tube. This shows the direction of the airflow out of the bag through the tube, and so it should be pointing AWAY from the bag. STEP FOUR Using both hands, squeeze the bag slowly and evenly, so that ALL the breath contained in the bag is expelled through the tester tube. This should take approximately 30 seconds. Note that it is entirely normal for the tester tube to warm up during this operation. This is simply an effect of the chemical reaction taking place between the expelled breath reacting with the yellow chemicals. STEP FIVE Evaluate the results under good lighting conditions. Results are best visible after approximately 2 minutes of taking the test. An ‘UNDER THE LIMIT’ result. An ‘OVER THE LIMIT’ result.