This is single clenbuterol test. You do not need UV light with this test. You only observe the color change.
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It is very simple to use the test. You drop your sample into test vial, liquid, powder or pill. You watch the color under day light (white light) and compare with the pictures.
Click here to see how to use this test.
The test reagent is corrosive. Use gloves and glasses. There is only 0.1 ml in each vial; this is how much you see on pictures. The origin is synthetic; there is no health and no biological hazard. The test kits are safe to ship worldwide, customs will not stop it.