Abstract: A computer-implemented system and method to provide options on products to enhance customers' experience. A computer-implemented system is operated that delivers to a customer an option to utilize up to n of m selected products, where n is less than or equal to m. Information is recorded in a data store, pertaining to said option. In addition, a system is operated to define each of the n chosen products, whereby after each of the n chosen products is defined, the customer can utilize said chosen product. The information pertaining to said defined products is recorded in a data store.

Abstract: A pipetting system having a plurality of tip fittings whose spacing can be simultaneously, quickly, and accurately adjusted so that the spacing between each adjacent tip fitting is substantially identical. The tip fittings are attached one to another by a linkage such as a pantographic linkage. The spacing is limited by an adjustable, slidable stop. Uniformly increasing and decreasing the spacing is accomplished by pulling and pushing a rod attached to one tip fitting.