All contracts, sales or purchases made for work to be done, or for anything to be sold or delivered or done by weight or measure within this state shall be taken and construed in terms of and according to the standards of weights and measures adopted under this act, except where parties have agreed upon any other calculations or measurement. All statements and representations of any kind referring to the weights or measures of commodities sold or purchased, or exposed for sale, shall be understood in terms of the standards of weights and measures adopted under this act.