Defendant, operator of a retail food store in Detroit, Michigan, was convicted of violating the comminuted meat law (MCLA § 289.582 [Stat Ann 1970 Cum Supp § 12.964 (2)(c)]), by selling or offering to sell hamburger with a fat content in excess of the statutory limit. Section 2(c) of the law provides:
“Fresh beef that has been comminuted, chopped, diced or ground shall be identified as either hamburger or ground beef and shall meet the following standards. Hamburger shall consist of comminuted, chopped, diced, or ground fresh beef with or without the addition of beef fat as such, and shall not con*481tain more than 30% of fat. Ground beef shall meet the same requirements as hamburger except that it shall not contain more than 20% fat.”
The testimony indicated that the hamburger in question contained 38.2% fat by weight analysis. Defendant points out that the statute does not prescribe weight analysis, however, and that there are other possible methods of analysis. Defendant contends that this lack of a prescribed method of measurement of fat content leaves the statute so vague and uncertain as to be unconstitutional, citing People v. Goulding (1936), 275 Mich 353.
It is true that there may be other methods of fat measurement than by weight. The record discloses, however, that a volume analysis would have found a higher fat content in the specimen taken. The record also discloses an accepted practice of fat measurement by weight, according to procedures set out in Official Methods of Associations of Official Agricultural Chemists. The uncontradicted testimony of the state’s chemist was that there was no other published method of analysis.
In People v. Jennings (1903), 132 Mich 662, the Court was concerned with adulteration of lemon extract under a statute which contained no specific standards or measurements. Trial testimony established the existence of a common acceptance of the United States Pharmacopoeia formula for lemon extract. It was held that when the legislature enacts protective legislation regulating food content, it,
“ * * * must have had in view some standard; and, as lemon essence or lemon extract had theretofore acquired a well-defined meaning, we incline to the view that it is proper to resort to the pharmacopoeia formula * * * .”
*482In the present case, there being one accepted method of fat analysis, i.e., by weight, the statute must be held to have contemplated that standard, a standard which could leave those dealing in com-minuted meats in no doubt as to their statutory obligation.
Defendant also contends that the clerk told the inspector he was selling meat loaf instead of hamburger. There is conflicting testimony. The decision turns upon the credibility of the witnesses. It was proper, therefore, for the jury to make its determination. People v. Morris (1968), 12 Mich App 411.
Finding no reversible error for the reasons discussed above, this Court affirms the decision of the trial court.
Affirmed.