ASTM C-403
For fast evaluation of the initial setting of concrete. It can be used on
light weight concrete, special roof deck mixes and concrete
additives.
Specification :
Consists of a needle having face area 3/10 sq. cm.
and graduated at a distance of 25cm. The needles point is an integral
part of barrel which houses a calibrated spring. The spring is
confined in a sleeve. The resistance offered by the concrete mortar is
shown on the direct reading scale with a marker ring which holds its
2 position when released. 2 Scale range is 0-50kg/cm when the
2 penetration resistance reaches a 2 value of 35kg/cm the concrete is
assumed initially set. Supplied complete in carrying case.