The K-Slump Tester rapidly indicates the water content, workability and standard slump of fresh concrete. The device has a pointed end for easy insertion into fresh concrete and a disc that controls the depth of penetration. When inserted, wet concrete enters the shaft through side openings and raises a floating plunger to give an estimate of concrete slump. The level of concrete retained in the probe after it has been withdrawn provides an index of water content and the degree of compaction. It should only be used when at least 6 in. (15 cm) of concrete surrounds the tester. Operating instructions and a correlation chart are included.