Ready mixed concrete producers have for some years looked eagerly at the highway market, an area which they have penetrated comparatively little. While much as been done in the last few years to make inroads into this large area of concrete construction possible, two problems still confront the ready mix producer interested in supplying concrete to highway projects: one is the problem of controlling the quality of the concrete to meet rigid state highway specification; the other is the problem of producing the large quantities of concrete needed to keep a paving train adequately supplied. Especially in these days of a mile a day or even two miles a day slip-form paving, maintaining a steady stream of high-quality concrete can prove to be a herculean task for a ready mix supplier. Today, there are two basic types of revolution counters: (1) a counter which records the total number of drum revolutions only and (2) a counter which either records only the total number of revolutions at mixing speed or that records the number of revolutions at mixing speed and also the total number of drum revolutions. The first type is relatively inexpensive. It costs approximately 50 dollars installed. However, some state highway departments feel that this type of counter does not accurately reflect true mixing time since it does not differentiate between agitation and mixing speeds. The second type of revolution counter costs, roughly, from 200 to 300 hundred dollars installed. In test conducted, it was found that their counts differed by 12 percent. In addition, malfunctions occurred in both brands.