Concrete Penetrometer — Spring Type

The Concrete Penetrometer (Proctor Needle Penetrometer, spring type) is used to determine the initial and final setting times of concrete and mortar by measuring the resistance offered to a graduated needle being pushed into the material at various time intervals after mixing. A calibrated spring assembly provides a controlled, measurable pushing force, and the penetration resistance value at each interval is used to plot a setting time curve, following the same underlying principle as the Proctor penetration method used for concrete.

It consists of a cylindrical spring housing with a plunger attached to the top of the spring. Penetration needle is attached to the other end of the spring housing. The plunger is graduated in 1 kg divisions, to a maximum capacity of 60 kg, which can be read with respect to the top end of the spring housing. A set of six needle points with areas of 645, 323, 161, 65, 32 and 16 mm² are provided.Supplied complete in a carrying case.