In the present research, an effective field tool for evaluating the rheological properties and workability of fresh concrete, i.e., self-compacting concrete (SCC), was developed. Conventional methods, such as the slump test, may be inadequate or misleading for mixes containing fibers, ground granulated blast furnace slag, or a high micro fines content. A detailed review of more than 50 workability measurement tests currently used and expert advice from the government, industry, and academic sectors found that there was a requirement for a device that would be more accurate and capable of use in field conditions. On account of this, a new low-cost hybrid rheometer was constructed. The device, about the size of a handheld drill, can be used manually or in a fixed position and is able to perform stress growth and flow curve testing. Use in field testing and ease of use were demonstrated, whereas laboratory testing on different concrete mixes proved its sensitivity to changes in workability and rheological properties. Compared with traditional workability testing, the proposed hybrid rheometer provides a cost-effective and reliable means to characterize the performance of concrete at the job site.