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The tester consists of a small (70 mm) glass tube containing yellow chemicals, which turn green in the presence of alcohol. The length of the green colour change is in proportion to the amount of alcohol. The tube has an arrow indicating the direction in which the breath must be passed and also a red calibration line indicating the legal driving limit.
Description
The tester consists of a small (70 mm) glass tube containing yellow chemicals, which turn green in the presence of alcohol. The length of the green colour change is in proportion to the amount of alcohol. The tube has an arrow indicating the direction in which the breath must be passed and also a red calibration line indicating the legal driving limit.





