(a) In all actions, civil or criminal, for violation of this article, testimonial evidence that a beverage was an alcoholic beverage, beer or wine may be offered by any person who, by experience in the past in handling or using alcoholic beverages, beer or wine or who by taste, smell or drinking of such liquids, has knowledge of the presence of the alcoholic content of the beverage or the intoxicating effect of the beverage.

(b) The presence of alcoholic content of any beverage, beer or wine may be shown by hydrometer or gravity test made in or away from the presence of the fact finder by any person who has knowledge of the use of such instrument, but the production of such evidence is optional.