Used to determine grade of bitumen. The penetration tests determine  consistency of bitumen for the purpose of grading. Depth in units 1/10 of millimeter to which a standard needle having a standard weight will  penetrate vertically in a duration of five seconds at a temperature of 25degree C  determines penetration for gradation

Specification:

It consists of a vertical pillar mounted on a base provided with leveling screws. The head, together with dial plunger rod a cone (or needle) slides on a pillar and can be clamp dat any desired height. A rack and pinion and pointer assemble provides fine adjustment of needle or cone tip to sample. It incorporates a clutch mechanism. Which makes reading of penetration and subsequent resetting a simple and accurate operation. The dial is graduated in 400 1/10 and the millimeter sub divisions and the needle pointer against figures makes easy reading. Supplied with a bitumen penetration needle, ring weight one each 50 gms. and 100gms.twosamplecontainers.

Accessories:

Penetration cone for empirical estimation of penetration of lubricating grease,  petroleum jelly etc.