The instrument consists of a needle attached to a spring loaded plunger, the stem of which is calibrated to read 0 to 40 kg division. Load stem is graduated at every 12.5 mm to read depth of penetration and for use with needles of larger areas. The small penetration stem is also graduated in 12.5 mm division and is used with needles of smaller areas. Needle points one each of 0.25, 0.5, 1.0, 1.5, 2.0, 3.5 and 6.0 sq. cm. and one tommy pin is supplied. Complete as above in a wooden carrying case.

This is identical to spring type, except that the penetration pressure on the needle is conveyed through a hydraulic system to a hydraulic pressure gauge. This system permits a greater control over rate of penetration because of better visibility of load indication.
Salient Features

• Specifications : Comprises hydraulic proctor needle system complete with a pressure gauge fixed at easily readable Angle reading 0-70kg. x 2 kg. A set of needle points consisting one each 0.25, 0.5,1.0,1.5,2.0,3.5, and 6.0 sq.cm. and a Tommy pin. Graduation at every 12.5 mm to indicate depth of penetration are marked on longer stem for use with needles of larger areas. Smaller stem is also graduated at every 12.5 mm and is used with needles of smaller areas. Complete as above in a wooden carrying case.