This apparatus is used for penetration test on a wide variety of materials such as greases, petroleum, bitumen, tar, wax, polish, food stuff, rubber asphalts and pharmaceutical creams. A given force is applied over a given period of time and the depression is made in the sample which is measured in tenths of a millimeter and expressed as penetration. It consists of a head support mounted on a vertical rod which can be adjusted for height. A rack and pinion and pointer assembly provides fine adjustment of needle tip to sample and in corporate a slipping clutch mechanism which make reading of penetration and subsequent resetting a sample and accurate operation. The dial is graduated from 0-400 in one tenth millimeter Sub Division. The Instrument is supplied with two sample containers.