For fast evaluation of the initial setting of concrete. It can be used on light weight concrete, special roof deck mixes and concrete additives. Consists of a needle and graduated at a distance of 25 cm. 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 position when released. Scale range 2i s 0-50 kg/cm when the penetration resistance reaches a value of 23 5kg/cm the concrete is assumed initially set. Supplied complete carry case.