"Feature: 1.In order to obtain the most accurate reading possible, try to ensure that the liquid is as close to 68 (20) as possible, as this is the temperature that the alcoholmeter has been calibrated to (should your alcoholmeter be calibrated to a different temperature, which should be stated on the meter, ensure that your liquid is at the quoted temperature). 2.Place your alcoholmeter in the sample and spin it do dislodge any bubbles that may have been in the liquid, and could potentially cause the alcoholmeter to float slightly higher, resulting in a low reading. Read the mark where the liquid level crosses the stem of the alcoholmeter. This is your percentage alcohol by volume. 4.Similar with hydrometer, but with a different measurement range (0-40% alcohol). The use of the breathalyzer is very simple. Pour the sample under test into a high glass or high chemical resistant plastic cylinder, leaving enough room for the alcoholometer to disperse the liquid. Specifications: 100% brand new high quality Material: Glass Style: 0-40 Quantity: 1pcs Package includes: 1pcs Alcoholmeter Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement."