Meets ASTM C403 and AASHTO T197 specifications.
The mortar penetration resistance apparatus determines the time of setting of concrete by penetration resistance. A representative sample of fresh concrete is sieved and the mortar is placed in a container. At regular time intervals, the resistance of the mortar to penetration is measured to estimate the initial and final setting times. Item includes penetration resistance needle sizes: 1, 1/2, 1/4, 1/10 and 1/40 sq. in. (645, 323, 161, 65, 32 and 16 mm². Graduated from 10 to 130 lbf (45 to 580 N) in increments of 2 lbf (9 N).